Sonnetvsstockfish-1320
Halbzuege (92)
1.e4Sonnet
1. Observe Halbzug 1, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 20. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search6ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Seize central control immediately per heuristic [OPENING central control] — occupy e4 or d4 with a pawn, follow up with both knights to natural squares (consistent with [OPENING knights before bishops]), …
- llm.plan34323ms · $0.0161
full reasoning
Phase: opening. Seize central control immediately per heuristic [OPENING central control] — occupy e4 or d4 with a pawn, follow up with both knights to natural squares (consistent with [OPENING knights before bishops]), then target castling kingside no later than move 6. Build a sound pawn center with no structural weaknesses, castle early to secure king safety, then steer into a slow positional plan that exploits the engine's horizon blindness beyond 6 moves — patience and structure over tactics. Critical: No opponent threats yet — pure development race; Risk: premature queen development or bishop deployment before knights wastes tempo and invites harassing pawn pushes; Engine pattern [engine horizon]: plan positional goals that only materialize after move 8-10 — the 1320 engine won't see them coming; Own priority: castling within 6 moves is non-negotiable per [EVAL king safety] — king exposed = game lost.
6. Candidates Candidates: e4 (Seizes central control immediately per [OPENING central control]; opens lines for bishop and queen, enables early castling.) | d4 (Occupies d4 per [OPENING central control]; leads to solid Queen's Pawn st…
- chess.js.legal_moves0ms
- llm.candidates9386ms · $0.0036
full reasoning
Candidates: e4 (Seizes central control immediately per [OPENING central control]; opens lines for bishop and queen, enables early castling.) | d4 (Occupies d4 per [OPENING central control]; leads to solid Queen's Pawn structures with no early king safety risk.) | Nf3 (Develops knight to natural square per [OPENING knights before bishops]; controls e5/d4, flexible against any Black response.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: e4 — Immediately seizes central control per [OPENING central control], opens lines for both the bishop and queen, and enables kingside castling within 5-6 moves per [EVAL king safety]. Most forcing — Black mu…
- llm.reflect10854ms · $0.0028
full reasoning
Final pick: e4 — Immediately seizes central control per [OPENING central control], opens lines for both the bishop and queen, and enables kingside castling within 5-6 moves per [EVAL king safety]. Most forcing — Black must respond concretely.. Rejected: d2d4, g1f3.
9. Commit Commit e4 (e2e4).
2...e5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: e7e5
- stockfish_uci1025ms
3.Nf3Sonnet
1. Observe Halbzug 3, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 29. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search11ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search6ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Per heuristic [OPENING knights before bishops]: develop the kingside knight to f3 immediately, attacking e5 and controlling d4. Then Bc4 or Nc3, d3 or d4 to reinforce the center, and castle kingside by mo…
- llm.plan27299ms · $0.0182
full reasoning
Phase: opening. Per heuristic [OPENING knights before bishops]: develop the kingside knight to f3 immediately, attacking e5 and controlling d4. Then Bc4 or Nc3, d3 or d4 to reinforce the center, and castle kingside by move 5. No deviation from this sequence without forced reason. Build a classical Open Game center (e4 pawn, d4 supported), castle kingside early to remove king risk, then use [engine horizon] blindness to execute a slow positional squeeze — pressure on e5 via Nf3+Nc3 before Black can equalize cleanly. Critical: Black's e5 pawn is currently undefended — Nf3 creates immediate pressure and gains tempo on development; Own king uncastled — heuristic [OPENING central control] satisfied by e4, but king safety is priority 1; no speculative ideas until castled; No opponent threats at ply 3 — pure development race; risk is only self-inflicted (premature d4 before Nf3, or early queen out per [OPENING queen late] warning).
6. Candidates Candidates: Nf3 (Heuristic [OPENING knights before bishops]: attacks undefended e5, develops piece, clears path to castle kingside.) | Bc4 (Italian setup: develops bishop toward f7, supports future d3/d4 center — keeps k…
- chess.js.legal_moves0ms
- llm.candidates17770ms · $0.0110
full reasoning
Candidates: Nf3 (Heuristic [OPENING knights before bishops]: attacks undefended e5, develops piece, clears path to castle kingside.) | Bc4 (Italian setup: develops bishop toward f7, supports future d3/d4 center — keeps king safety plan on track.) | Nc3 (Develops queenside knight, reinforces d4 push later; heuristic [OPENING central control] satisfied via piece pressure on d5/e4.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nf3 — Heuristic [OPENING knights before bishops] demands Nf3 first: attacks the undefended e5 pawn immediately, gaining tempo, while clearing the g1-square for kingside castling — king safety priority satisfi…
- llm.reflect11069ms · $0.0029
full reasoning
Final pick: Nf3 — Heuristic [OPENING knights before bishops] demands Nf3 first: attacks the undefended e5 pawn immediately, gaining tempo, while clearing the g1-square for kingside castling — king safety priority satisfied in one move.. Rejected: f1c4, b1c3.
9. Commit Commit Nf3 (g1f3).
4...d5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d7d5
- stockfish_uci1023ms
5.exd5Sonnet
1. Observe Halbzug 5, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 28. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search5ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Resolve the e4–d5 central tension immediately — either capture on d5 to win material or reinforce e4 and pressure Black's overextended center. Per [OPENING central control], the center must not be ceded; …
- llm.plan50244ms · $0.0357
full reasoning
Phase: opening. Resolve the e4–d5 central tension immediately — either capture on d5 to win material or reinforce e4 and pressure Black's overextended center. Per [OPENING central control], the center must not be ceded; Black's early d5 challenges White's e4 foothold and must be answered concretely. After resolving pawn tension: develop Nc3, target Bc4, and castle kingside within 3 moves. Per [engine horizon], Black's engine will calculate the immediate pawn skirmish but miss the positional squeeze that follows: after resolving the center, White establishes a dominant pawn structure, neutralizes Black's premature d5 thrust, and converts piece-development superiority into a long-term space and king-safety advantage. Critical: d5 attacks e4 directly — this tension MUST be resolved this move, no deferral; Black's e5+d5 tandem is aggressive but potentially loose once exchanged — the e5 pawn loses its d5 support after capture; King safety: neither side has castled — do not allow the position to open further before White's king is secure on g1.
6. Candidates Candidates: exd5 (Resolves e4–d5 tension immediately per [OPENING central control]; after Qxd5, Nc3 attacks queen, gaining a free tempo.) | Nc3 (Reinforces e4 and develops; per [OPENING central control], holding the cent…
- chess.js.legal_moves0ms
- llm.candidates72358ms · $0.0555
full reasoning
Candidates: exd5 (Resolves e4–d5 tension immediately per [OPENING central control]; after Qxd5, Nc3 attacks queen, gaining a free tempo.) | Nc3 (Reinforces e4 and develops; per [OPENING central control], holding the center and preparing Bc4 or d4 next.) | Bb5+ (Develops with check, disrupts Black's coordination; per king-safety heuristic, active pieces accelerate castling before further pawn exchanges.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: exd5 — Resolves central tension immediately per [OPENING central control]. After Qxd5, Nc3 attacks the queen, gaining free tempo for development. Black's e5 pawn loses d5 support and becomes a target. Pawn st…
- llm.reflect9035ms · $0.0030
full reasoning
Final pick: exd5 — Resolves central tension immediately per [OPENING central control]. After Qxd5, Nc3 attacks the queen, gaining free tempo for development. Black's e5 pawn loses d5 support and becomes a target. Pawn structure improves while opponent loses initiative.. Rejected: b1c3, f1b5.
9. Commit Commit exd5 (e4d5).
6...Nf6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: g8f6
- stockfish_uci1023ms
7.Nc3Sonnet
1. Observe Halbzug 7, Weiss am Zug. Phase: Eroeffnung. Weiss +1 Punkte. Legale Zuege: 28. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search9ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Defend the d5 pawn wedge immediately with Nc3 — this serves double duty as development and pawn protection, since Black's Nf6 attacks d5 directly. After Nc3: deploy Bc4 targeting f7 and the weakened diago…
- llm.plan79284ms · $0.0603
full reasoning
Phase: opening. Defend the d5 pawn wedge immediately with Nc3 — this serves double duty as development and pawn protection, since Black's Nf6 attacks d5 directly. After Nc3: deploy Bc4 targeting f7 and the weakened diagonal, then castle kingside. Three moves to complete development and secure the king. Use the d5 space wedge as a permanent positional asset to restrict Black's queenside, then apply diagonal pressure via Bc4 while Black's king remains uncastled — the engine will defend tactically but miss the slow positional squeeze per [engine horizon]. Critical: Black Nf6 attacks d5 directly — Nc3 must come this move or the pawn hangs to tempo-winning recapture; Black will likely play ...c6 next to undermine d5 — Nc3 prepares to recapture with piece if needed; Per [OPENING central control]: d5 pawn must not be ceded — it is the entire positional foundation; Per [OPENING knights before bishops]: Nc3 is the mandatory next step before Bc4 or Bb5; Own king exposed on e1 — Bc4 must be developed without delay to enable 0-0 within 2 moves.
6. Candidates Candidates: Nc3 (Per [OPENING knights before bishops], develops and shores up d5 wedge against Black's ...c6 undermining — mandatory step before any bishop move.) | Bc4 (Per [OPENING central control], develops bishop tow…
- chess.js.legal_moves0ms
- llm.candidates86404ms · $0.0708
full reasoning
Candidates: Nc3 (Per [OPENING knights before bishops], develops and shores up d5 wedge against Black's ...c6 undermining — mandatory step before any bishop move.) | Bc4 (Per [OPENING central control], develops bishop toward f7, enables O-O within one move, sustains d5 structural pressure without conceding space.) | Bb5+ (Developing check forces Black to commit knight or bishop, disrupting queenside coordination while keeping the d5 wedge fully intact.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nc3 — Per [OPENING knights before bishops], Nc3 develops while directly defending d5 — the entire positional foundation. Black's Nf6 attacks d5 immediately; Nc3 is the only move that shores up the pawn wedge …
- llm.reflect13868ms · $0.0033
full reasoning
Final pick: Nc3 — Per [OPENING knights before bishops], Nc3 develops while directly defending d5 — the entire positional foundation. Black's Nf6 attacks d5 immediately; Nc3 is the only move that shores up the pawn wedge this turn before considering bishop deployment.. Rejected: f1c4, f1b5.
9. Commit Commit Nc3 (b1c3).
8...c6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c7c6
- stockfish_uci1021ms
9.Bc4Sonnet
1. Observe Halbzug 9, Weiss am Zug. Phase: Eroeffnung. Weiss +1 Punkte. Legale Zuege: 31. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search12ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search4ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Deploy Bc4 now — knights are already out per [OPENING knights before bishops], so bishop activation with purpose (targeting f7 and the a2-g8 diagonal) is the correct next step. Then castle kingside immedi…
- llm.plan68285ms · $0.0495
full reasoning
Phase: opening. Deploy Bc4 now — knights are already out per [OPENING knights before bishops], so bishop activation with purpose (targeting f7 and the a2-g8 diagonal) is the correct next step. Then castle kingside immediately. Black's Nb8 sits idle on the back rank; maintain tempo pressure before it activates via c6 or d7. Hold the d5 space wedge as a permanent positional spine per [OPENING central control], castle to safety, and let Black's underdeveloped queenside (Nb8 still home, c6 pawn a lever that opens lines for White if traded) become the long-term liability — the 1320 engine will not see the slow positional squeeze past 6 moves per [engine horizon]. Critical: Black cxd5 threat: after Nxd5 White gains strong central knight, not a concession — welcome the trade; Black Nf6 may reroute to d5 or support e4 push — Bc4 and castling must come before Black consolidates; White king on e1 is the one real weakness — castle is non-negotiable this move or next; Black Nb8 undeveloped: White is 1-2 tempi ahead in development, do not let that gap close.
6. Candidates Candidates: Bc4 (Activates bishop toward f7, maintains king safety pressure — king on e1 is the priority weakness, castling must follow immediately.) | Nxe5 (Wins a pawn and central pawn structure stays solid; Black's un…
- chess.js.legal_moves0ms
- llm.candidates10536ms · $0.0039
full reasoning
Candidates: Bc4 (Activates bishop toward f7, maintains king safety pressure — king on e1 is the priority weakness, castling must follow immediately.) | Nxe5 (Wins a pawn and central pawn structure stays solid; Black's underdeveloped queenside (Nb8 idle) cannot counterattack quickly enough.) | Bb5 (Pins c6-lever support, exploiting Black's pawn structure liability on c6 while developing before castling — trade only when gaining structure.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bc4 — Per [OPENING knights before bishops]: both knights are out, bishop activation is next. Bc4 directly prepares 0-0 next move (king safety first), eyes f7 pressuring Black's underdeveloped camp, and anchor…
- llm.reflect33212ms · $0.0221
full reasoning
Final pick: Bc4 — Per [OPENING knights before bishops]: both knights are out, bishop activation is next. Bc4 directly prepares 0-0 next move (king safety first), eyes f7 pressuring Black's underdeveloped camp, and anchors the d5 positional spine per [OPENING central control]. King on e1 is the one real weakness — castling is non-negotiable.. Rejected: f3e5, f1b5.
9. Commit Commit Bc4 (f1c4).
10...cxd5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c6d5
- stockfish_uci1024ms
11.O-OSonnet
1. Observe Halbzug 11, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 35. Criticality: 0.40.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search16ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search4ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Castle kingside immediately — king safety is the single most urgent requirement. Then play d3 to solidify the center, support Bc4, and open the c1-bishop diagonal. Black's Nb8 and Bc8 remain idle; maintai…
- llm.plan50285ms · $0.0365
full reasoning
Phase: opening. Castle kingside immediately — king safety is the single most urgent requirement. Then play d3 to solidify the center, support Bc4, and open the c1-bishop diagonal. Black's Nb8 and Bc8 remain idle; maintain developmental lead before Black consolidates the d5-e5 pawn mass. Per [OPENING central control], Black's d5-e5 center is strong but unsupported by pieces — once White castles and plays d3, prepare a timely d4 break to dissolve that center and expose Black's underdeveloped queenside as a permanent liability. Critical: White king uncastled — f1-g1 corridor is clear; delay costs tempo and risks e-file exposure if Black pushes e4; Black may play Bg4, pinning Nf3 against Qd1 and indirectly pressuring the center — h3 as prophylaxis after castling is worth considering; Per [OPENING knights before bishops], all four light pieces are active (Nc3, Nf3, Bc4, Bc1 next); development phase nearly complete — transition to king safety now; Black's e5-d4 pawn advance would fork Nc3 and gain space — d3 played before that advance prevents it; Bc4 keeps f7 under long-term pressure; no need to trade or reposition it yet.
6. Candidates Candidates: O-O (King safety is the single most urgent requirement; f1-g1 corridor is clear, delay risks e-file exposure.) | d3 (Solidifies center per [OPENING central control]; prevents e4 fork on Nc3, opens c1-bishop d…
- chess.js.legal_moves0ms
- llm.candidates17204ms · $0.0118
full reasoning
Candidates: O-O (King safety is the single most urgent requirement; f1-g1 corridor is clear, delay risks e-file exposure.) | d3 (Solidifies center per [OPENING central control]; prevents e4 fork on Nc3, opens c1-bishop diagonal.) | h3 (Prophylaxis against Bg4 pinning Nf3; preserves knight mobility and avoids indirect center pressure.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: O-O — King safety is non-negotiable before any central action. Per [king safety first], the f1-g1 corridor is clear; every tempo spent uncastled risks e-file exposure after Black's e4 or Bg4 pin. Castle now, …
- llm.reflect11440ms · $0.0031
full reasoning
Final pick: O-O — King safety is non-negotiable before any central action. Per [king safety first], the f1-g1 corridor is clear; every tempo spent uncastled risks e-file exposure after Black's e4 or Bg4 pin. Castle now, then d3.. Rejected: d2d3, h2h3.
9. Commit Commit O-O (e1g1).
12...dxc4stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d5c4
- stockfish_uci1023ms
13.b3Sonnet
1. Observe Halbzug 13, Weiss am Zug. Phase: Eroeffnung. Schwarz +3 Punkte. Legale Zuege: 26. Criticality: 0.15.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search10ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Per [OPENING central control], Black's e5-c4 pawn mass must be challenged immediately — b3 attacks c4 directly to win back material parity, or d3 solidifies White's center before the c4 pawn advances to c…
- llm.plan86400ms · $0.0710
full reasoning
Phase: opening. Per [OPENING central control], Black's e5-c4 pawn mass must be challenged immediately — b3 attacks c4 directly to win back material parity, or d3 solidifies White's center before the c4 pawn advances to c3. Simultaneously activate Bc1 and exploit Black's uncastled king and idle Nb8/Bc8. Liquidate the c4 pawn via b3 to restore material balance, then activate Bc1 along the opened diagonal and press Black's king still stranded on e8 — per [OPENING knights before bishops], both White knights are optimally posted and the c1-bishop is now the single lagging piece whose activation unlocks all further plans. Critical: Black's c4 pawn threatening c3, which fractures White's c2-d2 duo and gives Black a dangerous passed pawn; Black's king on e8 uncastled — central file openings become tactical opportunities; White's c1-bishop completely inactive — must be deployed within 1-2 moves or Black consolidates freely; Black's Nb8 and Bc8 idle — initiative window is narrow, roughly 3-4 moves before they complete development.
6. Candidates Candidates: b3 (Directly attacks c4 per plan; pawn structure heuristic demands we remove this long-term liability before it advances to c3.) | Nxe5 (Wins the e5 pawn; trade-only-when-you-gain heuristic satisfied if c3 pu…
- chess.js.legal_moves0ms
- llm.candidates82350ms · $0.0660
full reasoning
Candidates: b3 (Directly attacks c4 per plan; pawn structure heuristic demands we remove this long-term liability before it advances to c3.) | Nxe5 (Wins the e5 pawn; trade-only-when-you-gain heuristic satisfied if c3 push doesn't compensate Black adequately.) | Nd5 (Strong centralization, attacks Nf6; per knights-before-bishops heuristic, outpost pressure limits Black's uncastled king options.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: b3 — Directly attacks c4 per plan heuristic — the c4 pawn is a long-term structural liability that must be liquidated before it advances to c3, fracturing White's c2-d2 duo. Removes the threat without concedi…
- llm.reflect9986ms · $0.0034
full reasoning
Final pick: b3 — Directly attacks c4 per plan heuristic — the c4 pawn is a long-term structural liability that must be liquidated before it advances to c3, fracturing White's c2-d2 duo. Removes the threat without conceding tempo or opening lines prematurely.. Rejected: f3e5, c3d5.
9. Commit Commit b3 (b2b3).
14...Bd6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f8d6
- stockfish_uci1003ms
15.bxc4Sonnet
1. Observe Halbzug 15, Weiss am Zug. Phase: Eroeffnung. Schwarz +3 Punkte. Legale Zuege: 28. Criticality: 0.15.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Liquidate the c4 pawn immediately via bxc4, restoring material balance and opening the b-file plus the c1-h6 diagonal. Follow by activating the lagging Bc1 — the sole undeveloped White piece. Use Black's …
- llm.plan65721ms · $0.0497
full reasoning
Phase: opening. Liquidate the c4 pawn immediately via bxc4, restoring material balance and opening the b-file plus the c1-h6 diagonal. Follow by activating the lagging Bc1 — the sole undeveloped White piece. Use Black's uncastled king on e8 as the pressure point before castling rights are exercised. Reinforce center with d3 if Black contests the recaptured pawn. Convert White's safe castled king and Black's idle queenside (Nb8, Bc8 still home) into lasting pressure by opening lines after bxc4 and pressing Black's exposed king before it reaches safety. Critical: c4 pawn is the immediate target — per [OPENING central control], White cannot allow Black a free advanced pawn chain; bxc4 restores parity and denies Black queenside space; Bc1 is White's only undeveloped piece — per [OPENING knights before bishops], both knights are optimally posted so the bishop must activate next or White forfeits the developmental edge; Black's king on e8 cannot castle safely once the b-file and c1-h6 diagonal open — this is a time-limited window that closes if Black plays Ke8-g8 via castling; Watch for Black's ...e4 push after bxc4, which could dislodge Nc3 and Nf3 simultaneously — d3 as a follow-up preempts this by anchoring the center.
6. Candidates Candidates: bxc4 (Per OPENING central control: recaptures the advanced c4 pawn, restores material parity, opens b-file and c1-h6 diagonal against Black's uncastled king.) | Bb2 (Per OPENING knights before bishops: both k…
- chess.js.legal_moves0ms
- llm.candidates9844ms · $0.0042
full reasoning
Candidates: bxc4 (Per OPENING central control: recaptures the advanced c4 pawn, restores material parity, opens b-file and c1-h6 diagonal against Black's uncastled king.) | Bb2 (Per OPENING knights before bishops: both knights are placed; Bc1 is the only undeveloped piece — Bb2 activates it immediately along the long diagonal toward Black's king.) | d3 (Anchors the center, preempts Black's ...e4 dislodging both knights, and supports recapture on c4 if bishop or knight retreats there.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: bxc4 — Per [OPENING central control]: Black cannot keep a free pawn on c4. Recapturing restores material parity, opens the b-file and c1-h6 diagonal against Black's uncastled king on e8 — a time-limited windo…
- llm.reflect25834ms · $0.0135
full reasoning
Final pick: bxc4 — Per [OPENING central control]: Black cannot keep a free pawn on c4. Recapturing restores material parity, opens the b-file and c1-h6 diagonal against Black's uncastled king on e8 — a time-limited window. Bb2 and d3 both concede the pawn.. Rejected: c1b2, d2d3.
9. Commit Commit bxc4 (b3c4).
16...O-Ostockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: e8g8
- stockfish_uci1007ms
17.d3Sonnet
1. Observe Halbzug 17, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 27. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search8ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Free the buried Bc1 via d3 (unblocks the c1–h6 diagonal), then maneuver Nc3 toward the d5 outpost before Black's Nb8 and Bc8 come alive. Use the temporary development lead aggressively. Neutralize Blac…
- llm.plan94998ms · $0.0666
full reasoning
Phase: middlegame. Free the buried Bc1 via d3 (unblocks the c1–h6 diagonal), then maneuver Nc3 toward the d5 outpost before Black's Nb8 and Bc8 come alive. Use the temporary development lead aggressively. Neutralize Black's bishop-pair advantage by anchoring a knight on the d5 outpost (heuristic: weak-squares outpost) and doubling rooks on the d- or c-file (heuristic: open-file rooks) to convert coordination into lasting pressure. Critical: Black's Nb8 and Bc8 are idle — White must act before they reach active squares; Bc1 is the worst White piece and the single biggest drag on the position; d3 fixes it this move; Black's bishop pair is a structural long-term weapon — keep pawns on both colours to limit their scope.
6. Candidates Candidates: d3 (Unblocks Bc1 (worst White piece) onto c1-h6 diagonal; plan explicitly states 'd3 fixes it this move'.) | Nd5 (Immediately claims the weak-squares outpost heuristic target before idle Nb8/Bc8 can challenge…
- chess.js.legal_moves0ms
- llm.candidates52709ms · $0.0395
full reasoning
Candidates: d3 (Unblocks Bc1 (worst White piece) onto c1-h6 diagonal; plan explicitly states 'd3 fixes it this move'.) | Nd5 (Immediately claims the weak-squares outpost heuristic target before idle Nb8/Bc8 can challenge it.) | Ne4 (Solid knight repost toward d6; pressures Bd6 while Black's open-file rooks heuristic demands White acts first.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: d3 — Frees Bc1 (worst-piece heuristic) onto c1-h6 diagonal immediately. Nd5 premature — Nxd5 cxd5 opens lines for Black's bishop-pair before open-file rooks heuristic can be exploited. Patient structure beats…
- llm.reflect56743ms · $0.0434
full reasoning
Final pick: d3 — Frees Bc1 (worst-piece heuristic) onto c1-h6 diagonal immediately. Nd5 premature — Nxd5 cxd5 opens lines for Black's bishop-pair before open-file rooks heuristic can be exploited. Patient structure beats speculative outpost claim.. Rejected: c3d5, c3e4.
9. Commit Commit d3 (d2d3).
18...Nc6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: b8c6
- stockfish_uci1022ms
19.Be3Sonnet
1. Observe Halbzug 19, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 33. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search11ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Activate Bc1 via Be3 (unblocks c1–h6 diagonal, supports future d4 or d5 ideas), then execute Nc3–d5 outpost — the weak-squares outpost heuristic makes d5 the single most important square in this struct…
- llm.plan52273ms · $0.0388
full reasoning
Phase: middlegame. Activate Bc1 via Be3 (unblocks c1–h6 diagonal, supports future d4 or d5 ideas), then execute Nc3–d5 outpost — the weak-squares outpost heuristic makes d5 the single most important square in this structure. If Black captures Nxd5 cxd5, use open-file rooks on the c- or d-file immediately to compensate. If Black does not take, the knight on d5 paralyzes the position for 10+ moves. Plant a knight permanently on d5 to neutralize Black's bishop pair, then double rooks on the d-file or c-file (open-file rooks heuristic) to convert structural dominance into lasting queenside pressure before Black's Bc8 and latent queenside pieces come alive. Critical: Black's Nf6 can recapture on d5 after Nc3–d5 — must evaluate whether cxd5 gives Black dangerous central majority or whether the open c-file compensates White sufficiently; Bc1 is functionally a dead piece until Be3 is played — every move it stays on c1 is a tempo conceded; Black's e5 pawn controls d4 and f4, ruling out a central break there — all progress runs through d5 not d4.
6. Candidates Candidates: Be3 (Bc1 is a dead piece until Be3 — every tempo it stays on c1 is conceded; activates diagonal and directly supports the Nd5 outpost plan.) | Nd5 (Weak-squares outpost heuristic: d5 is the single most import…
- chess.js.legal_moves0ms
- llm.candidates28755ms · $0.0201
full reasoning
Candidates: Be3 (Bc1 is a dead piece until Be3 — every tempo it stays on c1 is conceded; activates diagonal and directly supports the Nd5 outpost plan.) | Nd5 (Weak-squares outpost heuristic: d5 is the single most important square in this structure; plants knight permanently, neutralizing Black's bishop pair.) | Ne4 (Improves worst-placed knight toward d6 or f6 without conceding material; keeps tension, consistent with 'trade only when you gain' principle.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Be3 — Bc1 is a dead piece — open-file rooks and weak-squares heuristics both require Be3 first. It activates the diagonal, directly supports the Nd5 outpost plan, and loses zero material while gaining a full …
- llm.reflect9418ms · $0.0030
full reasoning
Final pick: Be3 — Bc1 is a dead piece — open-file rooks and weak-squares heuristics both require Be3 first. It activates the diagonal, directly supports the Nd5 outpost plan, and loses zero material while gaining a full tempo of development.. Rejected: c3d5, c3e4.
9. Commit Commit Be3 (c1e3).
20...Bb4stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d6b4
- stockfish_uci1023ms
21.Nd5Sonnet
1. Observe Halbzug 21, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 38. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search9ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search4ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Execute Nc3–d5 — the outpost plan seeded last move. Be3 is already in place and supports d5 from behind. If Black takes Nxd5, recapture with cxd5, opening the c-file immediately. If Black avoids, the k…
- llm.plan59756ms · $0.0446
full reasoning
Phase: middlegame. Execute Nc3–d5 — the outpost plan seeded last move. Be3 is already in place and supports d5 from behind. If Black takes Nxd5, recapture with cxd5, opening the c-file immediately. If Black avoids, the knight on d5 paralyzes Black's queenside structure for the next 5–8 moves while we regroup rooks. Anchor an unassailable knight on d5 (weak-squares outpost heuristic — no Black pawn can challenge d5) to neutralize the bishop pair advantage, then activate both rooks on the c-file or d-file (open-file rooks heuristic) to convert structural dominance into a concrete queenside advantage. Critical: Bb4 may capture Nc3 before we execute Nd5, handing Black doubled-pawn compensation on the c-file and losing the outpost idea entirely; Black's e5 pawn controls d4 — the only clean route to the outpost is Nc3–d5 direct, not via d4; Engine-horizon pattern: the d5 knight plan pays off 6–8 moves out, beyond a 1320 engine's accurate evaluation window — set it up patiently without rushing kingside action.
6. Candidates Candidates: Nd5 (Outpost heuristic: d5 unassailable (no Black pawn challenges it), paralyzing Black's queenside structure for 5-8 moves.) | a3 (Preparatory: chase Bb4 before it disrupts Nd5 plan; forces bishop decision, …
- chess.js.legal_moves0ms
- llm.candidates66770ms · $0.0571
full reasoning
Candidates: Nd5 (Outpost heuristic: d5 unassailable (no Black pawn challenges it), paralyzing Black's queenside structure for 5-8 moves.) | a3 (Preparatory: chase Bb4 before it disrupts Nd5 plan; forces bishop decision, securing the c3-d5 path cleanly.) | Rc1 (Open-file rooks heuristic: Rc1 stakes the c-file immediately, converting structural dominance into concrete queenside pressure.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nd5 — Weak-squares outpost heuristic: d5 is unassailable (no Black pawn on c6 or e6). Moving to d5 also voids the Bb4xc3 threat entirely — the knight leaves c3, so Black gains nothing. If Black plays Nxd5, cx…
- llm.reflect44348ms · $0.0343
full reasoning
Final pick: Nd5 — Weak-squares outpost heuristic: d5 is unassailable (no Black pawn on c6 or e6). Moving to d5 also voids the Bb4xc3 threat entirely — the knight leaves c3, so Black gains nothing. If Black plays Nxd5, cxd5 opens the c-file immediately (open-file rooks heuristic), converting the outpost into concrete queenside pressure.. Rejected: a2a3, a1c1.
9. Commit Commit Nd5 (c3d5).
22...Bd6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: b4d6
- stockfish_uci1004ms
23.Rc1Sonnet
1. Observe Halbzug 23, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 40. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Sustain the d5 outpost and force Black to declare intentions. If Black exchanges on d5, recapture and open the c-file immediately for rook activation. If Black avoids the trade, push the queenside pawn…
- llm.plan86528ms · $0.0704
full reasoning
Phase: middlegame. Sustain the d5 outpost and force Black to declare intentions. If Black exchanges on d5, recapture and open the c-file immediately for rook activation. If Black avoids the trade, push the queenside pawn forward to gain more space and further restrict the bishop pair. Connect queen and rooks. Exploit the weak-squares outpost heuristic — Nd5 cannot be challenged by Black pawns and neutralizes the bishop pair; then activate both rooks on the c-file or d-file per the open-file rooks heuristic to convert structural superiority into a concrete endgame edge despite the material deficit. Critical: Black can exchange immediately on d5 — must recapture precisely and double rooks on the newly opened file before Black consolidates; Black's e5 pawn limits Be3 lateral range — bishop may need repositioning or must accept a passive role short-term; Bd6 is currently locked behind the e5 pawn but becomes dangerous if the position opens — avoid releasing tension unless rooks are already activated.
6. Candidates Candidates: Nxf6+ (Heuristic 1 (weak-squares outpost): trades Nd5 for Nf6+, forcing gxf6 and creating permanent Black kingside weakness to exploit.) | Rc1 (Open-file rooks heuristic: activates rook on c-file immediately;…
- chess.js.legal_moves0ms
- llm.candidates110916ms · $0.0885
full reasoning
Candidates: Nxf6+ (Heuristic 1 (weak-squares outpost): trades Nd5 for Nf6+, forcing gxf6 and creating permanent Black kingside weakness to exploit.) | Rc1 (Open-file rooks heuristic: activates rook on c-file immediately; prepares doubling and c5 break without positional concessions.) | c5 (Queenside expansion per plan; restricts Bd6, gains space; unlike heuristic Nxe5, avoids dropping Nd5 to ...Nxd5 after recapture.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Rc1 — Activates the rook on the open c-file per open-file rooks heuristic without concessions. Nd5 outpost remains intact, keeping maximum pressure. Prepares c5 break or Nxf6+ from a position of strength.. Re…
- llm.reflect10981ms · $0.0031
full reasoning
Final pick: Rc1 — Activates the rook on the open c-file per open-file rooks heuristic without concessions. Nd5 outpost remains intact, keeping maximum pressure. Prepares c5 break or Nxf6+ from a position of strength.. Rejected: d5f6, c4c5.
9. Commit Commit Rc1 (a1c1).
24...Bg4stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c8g4
- stockfish_uci1006ms
25.h3Sonnet
1. Observe Halbzug 25, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 36. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Break the Bg4 pin on Nf3 first — h3 forces Black to declare (Bh5, Bxf3, or retreat). If Bxf3 recapture with queen to avoid doubled pawns. Then sustain Nd5 and slide Rc1 down the c-file per the open-fil…
- llm.plan77231ms · $0.0579
full reasoning
Phase: middlegame. Break the Bg4 pin on Nf3 first — h3 forces Black to declare (Bh5, Bxf3, or retreat). If Bxf3 recapture with queen to avoid doubled pawns. Then sustain Nd5 and slide Rc1 down the c-file per the open-file rooks heuristic. If Black exchanges on d5, cxd5 opens the c-file immediately for rook activation. Exploit the weak-squares outpost heuristic: Nd5 sits on an untouchable square that paralyzes Black's piece coordination and neutralizes the bishop pair; combine it with open-file rook pressure on c7 or d-file to convert structural superiority into endgame edge despite being two pawns down in material. Critical: Bg4 pins Nf3 to Qd1 — this is urgent: Black threatens Nd4 or Bxf3 gxf3, shattering White kingside pawns; h3 must be addressed now; Nd5 outpost (weak-squares heuristic) is White's core asset — any trade sequence must preserve or improve the knight's grip on d5; Rc1 already eyes the c-file (open-file rooks heuristic) — after breaking the pin, connecting queen and rooks with Qd2 or activating Rc1-c7 is the structural conversion plan.
6. Candidates Candidates: h3 (Plan priority: breaks Bg4 pin on Nf3, forces Black to declare — directly addressing the urgent king-safety threat.) | Nxf6+ (Heuristic suggestion: wins material and shatters Black's kingside pawns, though…
- chess.js.legal_moves0ms
- llm.candidates26261ms · $0.0189
full reasoning
Candidates: h3 (Plan priority: breaks Bg4 pin on Nf3, forces Black to declare — directly addressing the urgent king-safety threat.) | Nxf6+ (Heuristic suggestion: wins material and shatters Black's kingside pawns, though trades the Nd5 outpost asset.) | Qd2 (Open-file rooks heuristic: connects queen to Rc1, prepares Rc7 infiltration while supporting the Nd5 outpost grip.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: h3 — Breaks the Bg4 pin immediately — the weak-squares heuristic demands Nd5 stay alive, and the pin threatens Bxf3 gxf3 shattering our kingside. h3 forces Black to declare while preserving both Nf3 and the N…
- llm.reflect9976ms · $0.0034
full reasoning
Final pick: h3 — Breaks the Bg4 pin immediately — the weak-squares heuristic demands Nd5 stay alive, and the pin threatens Bxf3 gxf3 shattering our kingside. h3 forces Black to declare while preserving both Nf3 and the Nd5 outpost.. Rejected: d5f6, d1d2.
9. Commit Commit h3 (h2h3).
26...Bf5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: g4f5
- stockfish_uci1008ms
27.Nxf6+Sonnet
1. Observe Halbzug 27, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 38. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Sustain the Nd5 outpost (weak-squares outpost heuristic — the knight is untouchable by pawns and paralyzes Nc6/Nf6 coordination). Activate Rc1 down the c-file (open-file rooks heuristic) before Black c…
- llm.plan105903ms · $0.0918
full reasoning
Phase: middlegame. Sustain the Nd5 outpost (weak-squares outpost heuristic — the knight is untouchable by pawns and paralyzes Nc6/Nf6 coordination). Activate Rc1 down the c-file (open-file rooks heuristic) before Black consolidates. If Black liquidates on d5, recapture cxd5 blows the c-file wide open for immediate rook pressure. Pre-empt the Bxe3 trade that would double our e-pawns. Convert Nd5 structural dominance and c-file rook activation into enough concrete pressure on c7 and the d-file to neutralize Black's two-point material lead and bishop-pair long-term superiority. Critical: Black Bxe3 fxe3 — removes our only bishop, creates doubled e-pawns; if it comes, f-file opens for Rf1 as partial compensation; Black Nxd5 cxd5 — liquidates the key outpost; c-file then opens for rook activation per open-file heuristic; Black e4 advance — threatens to restrict Nf3 and Be3 simultaneously; monitor closely; Material deficit of 2 points means passive play loses — active c-file + Nd5 pressure is mandatory, not optional.
6. Candidates Candidates: Nxf6+ (captures n+check score=5) | Nxe5 (captures p+centre score=4) | Bxa7 (captures p score=3) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nxf6+ — Captures knight with check, forcing gxf6 or Qxf6. Destroys Black's kingside pawn structure (weak-squares outpost heuristic: eliminates Nf6 defender) and opens g-file. Material gain plus initiative.. R…
- llm.reflect13866ms · $0.0031
full reasoning
Final pick: Nxf6+ — Captures knight with check, forcing gxf6 or Qxf6. Destroys Black's kingside pawn structure (weak-squares outpost heuristic: eliminates Nf6 defender) and opens g-file. Material gain plus initiative.. Rejected: f3e5, e3a7.
9. Commit Commit Nxf6+ (d5f6).
28...gxf6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: g7f6
- stockfish_uci1025ms
29.Nxe5Sonnet
1. Observe Halbzug 29, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 31. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search15ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search4ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Halbzug 29, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 31. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate pieces, attack weak pawns, keep the i…
full reasoning
Phase: middlegame. Halbzug 29, Weiss am Zug. Phase: Mittelspiel. Schwarz +2 Punkte. Legale Zuege: 31. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate pieces, attack weak pawns, keep the initiative. [LLM-Error: Claude CLI subprocess timed out after 120000ms]
6. Candidates Candidates: Nxe5 (captures p+centre score=4) | Bxa7 (captures p score=3) | d4 (centre score=1) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nxe5 — captures p+centre score=4. Rejected: e3a7, d3d4. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Nxe5 (f3e5).
30...Bxe5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d6e5
- stockfish_uci1005ms
31.d4Sonnet
1. Observe Halbzug 31, Weiss am Zug. Phase: Mittelspiel. Schwarz +4 Punkte. Legale Zuege: 28. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Push d4 to challenge Black's dominant Be5 directly, then activate the passive Rf1 by doubling on the c-file (open-file rook principle) or relocating to e1, while preventing the bishop pair from coordin…
- llm.plan114452ms · $0.0837
full reasoning
Phase: middlegame. Push d4 to challenge Black's dominant Be5 directly, then activate the passive Rf1 by doubling on the c-file (open-file rook principle) or relocating to e1, while preventing the bishop pair from coordinating against the White king on g1 From a material deficit of −4, White must generate immediate piece activity through rook centralisation on open files and bishop neutralisation to avoid positional collapse from the bishop pair dominating the dark squares around the White king. Critical: Black's Be5 covers h2 directly adjacent to Kg1 — immediate king-safety alarm; any inaccuracy allows ...Bxh2+ or ...Bg3 ideas; Bf5 attacks h3 pawn (via g4) and commands the c2–d3 diagonal — structural pressure that tightens as Black improves; Rf1 is completely passive; the open-file rook heuristic demands it reach c1 (doubling) or e1 within the next two moves — leaving it on f1 wastes the rook and cedes all initiative to Black; the outpost heuristic also warns that Black's Nc6 is well-centralised and will grow stronger once the bishops fix White's structure.
6. Candidates Candidates: d4 (Directly challenges Be5 per plan; king-safety heuristic: forces the h2-threatening bishop to relocate immediately.) | Re1 (Open-file rook principle: Rf1 is completely passive; Re1 centralises it and press…
- chess.js.legal_moves0ms
- llm.candidates28379ms · $0.0205
full reasoning
Candidates: d4 (Directly challenges Be5 per plan; king-safety heuristic: forces the h2-threatening bishop to relocate immediately.) | Re1 (Open-file rook principle: Rf1 is completely passive; Re1 centralises it and pressures Be5 along the e-file.) | Qg4+ (Material-deficit heuristic demands immediate activity; harasses Black's king, creating counter-threats to offset −4 deficit.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: d4 — King-safety heuristic is the top priority: Be5 sits on the h2-diagonal threatening ...Bxh2+ next to Kg1. d4 forces the bishop off that diagonal immediately. The open-file rook principle also benefits — d…
- llm.reflect53222ms · $0.0383
full reasoning
Final pick: d4 — King-safety heuristic is the top priority: Be5 sits on the h2-diagonal threatening ...Bxh2+ next to Kg1. d4 forces the bishop off that diagonal immediately. The open-file rook principle also benefits — d4 opens the d-file for the rooks, converting a defensive necessity into piece activity.. Rejected: f1e1, d1g4.
9. Commit Commit d4 (d3d4).
32...Bb8stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: e5b8
- stockfish_uci1004ms
33.d5Sonnet
1. Observe Halbzug 33, Weiss am Zug. Phase: Mittelspiel. Schwarz +4 Punkte. Legale Zuege: 25. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Halbzug 33, Weiss am Zug. Phase: Mittelspiel. Schwarz +4 Punkte. Legale Zuege: 25. Criticality: 0.10. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate pieces, attack weak pawns, keep the i…
full reasoning
Phase: middlegame. Halbzug 33, Weiss am Zug. Phase: Mittelspiel. Schwarz +4 Punkte. Legale Zuege: 25. Criticality: 0.10. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate pieces, attack weak pawns, keep the initiative. [LLM-Error: Claude CLI subprocess timed out after 120000ms]
6. Candidates Candidates: d5 (Central thrust attacks Nc6 directly. Heuristic: keep the initiative — forces knight to passive squares, opens lines for Rc1.) | Qg4+ (If Kh8, Qxf5 wins the bishop outright. Heuristic: attack weak pawns — …
- chess.js.legal_moves0ms
- llm.candidates78304ms · $0.0625
full reasoning
Candidates: d5 (Central thrust attacks Nc6 directly. Heuristic: keep the initiative — forces knight to passive squares, opens lines for Rc1.) | Qg4+ (If Kh8, Qxf5 wins the bishop outright. Heuristic: attack weak pawns — Bf5 is undefended after forced king move.) | Bg5 (Activates the worst piece, targets weak f6 pawn. Heuristic: activate pieces — bishop on e3 was idle, now joins the attack.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: d5 — Central thrust attacks Nc6 directly. Heuristic: keep the initiative — forces knight to passive squares, opens lines for Rc1.. Rejected: d1g4, e3g5. [LLM note: Claude CLI subprocess timed out after 120000…
full reasoning
Final pick: d5 — Central thrust attacks Nc6 directly. Heuristic: keep the initiative — forces knight to passive squares, opens lines for Rc1.. Rejected: d1g4, e3g5. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit d5 (d4d5).
34...Bg6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f5g6
- stockfish_uci1007ms
35.Re1Sonnet
1. Observe Halbzug 35, Weiss am Zug. Phase: Mittelspiel. Schwarz +4 Punkte. Legale Zuege: 31. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Activate both rooks via the fully open e-file before Black's knight reaches e5. The e-file is the only completely open file — Rfe1 followed by Rce1 or Re-file doubling gives White immediate piece activ…
- llm.plan61285ms · $0.0431
full reasoning
Phase: middlegame. Activate both rooks via the fully open e-file before Black's knight reaches e5. The e-file is the only completely open file — Rfe1 followed by Rce1 or Re-file doubling gives White immediate piece activity to offset the material deficit. Simultaneously, keep the d5 pawn mobile as a long-term lever. Trade White's structural space advantage (d5 passed pawn + c4 chain) for active rook pressure on the e-file and second rank, neutralizing Black's extra minor-piece material through positional activity rather than direct attack. Critical: Black Nc6 threatens Ne5 — a strong outpost (MIDDLE weak squares outpost heuristic). If Ne5 lands, Black's knight dominates and White's bishop on e3 is under pressure. Contesting or closing this square is urgent.; E-file is fully open (no pawns for either side) — direct application of MIDDLE open file rooks heuristic. White must occupy it immediately or cede the file to Black's rooks.; White's Bb8 (Black's) is completely passive behind the f6/f7 pawn wall — this is a long-term strategic asset for White if the position stays closed near the queenside.; Black may push f6-f5 to challenge d5 pawn or activate Bg6 — White must not allow the d5 pawn to become a permanent target without rook support behind it..
6. Candidates Candidates: Re1 (Occupies the only fully open e-file at once; open-file rooks heuristic — prepares rook-doubling to neutralise material deficit.) | Bd4 (Bd4 controls e5 directly, blocking Nc6-e5 outpost; addresses weak-s…
- chess.js.legal_moves0ms
- llm.candidates43387ms · $0.0349
full reasoning
Candidates: Re1 (Occupies the only fully open e-file at once; open-file rooks heuristic — prepares rook-doubling to neutralise material deficit.) | Bd4 (Bd4 controls e5 directly, blocking Nc6-e5 outpost; addresses weak-squares outpost heuristic before Black's knight dominates.) | d6 (Advances the passed pawn as a long-term lever, gaining space and forcing Black to react rather than organise Ne5.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Re1 — Occupies the only fully open e-file at once; open-file rooks heuristic — prepares rook-doubling to neutralise material deficit.. Rejected: e3d4, d5d6. [LLM note: Claude CLI subprocess timed out after 12…
full reasoning
Final pick: Re1 — Occupies the only fully open e-file at once; open-file rooks heuristic — prepares rook-doubling to neutralise material deficit.. Rejected: e3d4, d5d6. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Re1 (f1e1).
36...Ne7stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c6e7
- stockfish_uci1005ms
37.d6Sonnet
1. Observe Halbzug 37, Weiss am Zug. Phase: Mittelspiel. Schwarz +4 Punkte. Legale Zuege: 31. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Per the open-file-rooks heuristic, Re1 is already on the sole open e-file — Rc1-e1 doubling is the logical next step to maximise rook pressure against Black's second rank. Simultaneously, the weak-squa…
- llm.plan64293ms · $0.0488
full reasoning
Phase: middlegame. Per the open-file-rooks heuristic, Re1 is already on the sole open e-file — Rc1-e1 doubling is the logical next step to maximise rook pressure against Black's second rank. Simultaneously, the weak-squares heuristic demands we track Ne7: its natural routes are c6 (attacking d5) and f5 (forking Be3). Blunting Ne7's mobility while threatening d5-d6 is the 3-move arc. Turn the d5 passed pawn into a decisive lever by advancing it to d6 under doubled-rook support, restricting Black's passive Bb8 and Ne7 simultaneously, and converting spatial superiority into a promotion threat that more than compensates for the material deficit. Critical: Ne7-c6 attacks d5 directly — calculate whether d6 advance wins material or if c6 knight becomes a blockader; Ne7-f5 attacks Be3 — losing the bishop for knight weakens the compensation model; Be3 must be kept flexible; Bb8 is currently entombed behind a7/b7 pawns — avoid any exchange that frees it (e.g. opening the b-file); d5-d6 concrete calculation needed: does it fork Qd8 and Rf8, or does Black simply ignore and consolidate?.
6. Candidates Candidates: d6 (Primary lever per plan: restricts Bb8 and Ne7-c6 simultaneously, converts spatial superiority into promotion threat.) | Bd4 (Weak-squares heuristic: removes Be3 from Ne7-f5 fork, centralises bishop, suppo…
- chess.js.legal_moves0ms
- llm.candidates46793ms · $0.0355
full reasoning
Candidates: d6 (Primary lever per plan: restricts Bb8 and Ne7-c6 simultaneously, converts spatial superiority into promotion threat.) | Bd4 (Weak-squares heuristic: removes Be3 from Ne7-f5 fork, centralises bishop, supports d6 advance next move.) | Qd4 (Open-file-rooks heuristic: queen joins Re1 pressure, eyes d6 thrust and kingside, keeps Bb8 entombed.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: d6 — Attacks Ne7 immediately per weak-squares heuristic; forces knight to an inferior square, then d7 under e-file rook support creates an unstoppable promotion threat. Bb8 stays entombed.. Rejected: e3d4, d1…
- llm.reflect103549ms · $0.0847
full reasoning
Final pick: d6 — Attacks Ne7 immediately per weak-squares heuristic; forces knight to an inferior square, then d7 under e-file rook support creates an unstoppable promotion threat. Bb8 stays entombed.. Rejected: e3d4, d1d4.
9. Commit Commit d6 (d5d6).
38...Bxd6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: b8d6
- stockfish_uci1007ms
39.Bd4Sonnet
1. Observe Halbzug 39, Weiss am Zug. Phase: Mittelspiel. Schwarz +5 Punkte. Legale Zuege: 32. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search6ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Per the open-file-rooks heuristic, Re1 already anchors the e-file — the plan is to coordinate Qd1 away from d1 to free rook doubling potential, while the weak-squares heuristic demands Ne7→f5 be neutra…
- llm.plan100752ms · $0.0815
full reasoning
Phase: middlegame. Per the open-file-rooks heuristic, Re1 already anchors the e-file — the plan is to coordinate Qd1 away from d1 to free rook doubling potential, while the weak-squares heuristic demands Ne7→f5 be neutralised immediately (it forks Be3 and destabilises the bishop pair). Secondary lever: c4-c5 advance to crack Black's queenside and target the structural liability of doubled f-pawns (f6/f7). Fight the −5 material deficit through maximum rook activity on the e-file and a timely c4-c5 thrust, using Black's doubled f-pawns and Ne7's limited outpost options as pressure handles to generate complications before Black simply consolidates. Critical: Ne7-f5 is the critical threat — it forks Be3 and forces a concession; White must decide whether to pre-empt it (g2-g4) or absorb it tactically; Black's +5 material advantage means passive play loses — White must create concrete threats on the e-file or queenside within 2-3 moves; c4 is an IQP-like isolated advanced pawn (IQP heuristic): advancing to c5 gains space and opens lines, but hands Black a blockade square on d5 for Ne7.
6. Candidates Candidates: Bd4 (Removes Be3 as Ne7-f5 fork target (weak-squares heuristic); centralizes bishop powerfully on d4, supporting the c4-c5 lever without weakening the king.) | c5 (Executes the c4-c5 plan thrust immediately; …
- chess.js.legal_moves0ms
- llm.candidates84418ms · $0.0665
full reasoning
Candidates: Bd4 (Removes Be3 as Ne7-f5 fork target (weak-squares heuristic); centralizes bishop powerfully on d4, supporting the c4-c5 lever without weakening the king.) | c5 (Executes the c4-c5 plan thrust immediately; attacks Bd6 and opens c-file for rook activity (open-file-rooks heuristic), creating concrete queenside pressure.) | g4 (Pre-empts Ne7-f5 by controlling f5 outpost (weak-squares heuristic); avoids forced concession before White has time to execute the c-file/e-file plan.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bd4 — Removes Be3 as Ne7-f5 fork target (weak-squares heuristic); centralizes bishop powerfully on d4, supporting the c4-c5 lever without weakening the king.. Rejected: c4c5, g2g4. [LLM note: Claude CLI subpr…
full reasoning
Final pick: Bd4 — Removes Be3 as Ne7-f5 fork target (weak-squares heuristic); centralizes bishop powerfully on d4, supporting the c4-c5 lever without weakening the king.. Rejected: c4c5, g2g4. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Bd4 (e3d4).
40...Nf5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: e7f5
- stockfish_uci1007ms
41.Bxf6Sonnet
1. Observe Halbzug 41, Weiss am Zug. Phase: Endspiel. Schwarz +5 Punkte. Legale Zuege: 36. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Challenge the powerful knight outpost via a kingside pawn lever or bishop repositioning, then execute the queenside pawn advance to create passed-pawn pressure and crack Black's doubled f-pawn weakness. C…
- llm.plan73285ms · $0.0512
full reasoning
Phase: endgame. Challenge the powerful knight outpost via a kingside pawn lever or bishop repositioning, then execute the queenside pawn advance to create passed-pawn pressure and crack Black's doubled f-pawn weakness. Coordinate both rooks on semi-open files. The engine-horizon opponent pattern — misses plans beyond 6 moves — favors deliberate queenside maneuvering while Black calculates short-range tactical threats. Neutralize the five-point material deficit by forcing simplification toward a drawn rook endgame, exploiting the queenside pawn majority and doubled f-pawn liability; Lucena bridge-building and Philidor third-rank defense technique become the decisive technical layer once queens leave the board. Critical: Knight on outpost threatens kingside penetration (via the h-file diagonal) and a fork on the bishop once the diagonal opens — neutralization is the first priority; Five-point material deficit makes passive defense a slow loss; only continuous rook-file pressure and structural leverage create drawing chances; Queenside pawn advance disrupts Black's formation and forces defensive concessions; must be timed before Black can centralize the rooks and dominate open lines.
6. Candidates Candidates: Bxa7 (captures p score=3) | Bxf6 (captures p score=3) | Be5 (centre score=1) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bxf6 — Eliminates the f6-bishop and wrecks Black's kingside pawn structure. Recapture gxf6 creates doubled f-pawns — a permanent structural liability that echoes the plan's doubled f-pawn exploitation heurist…
- llm.reflect11913ms · $0.0034
full reasoning
Final pick: Bxf6 — Eliminates the f6-bishop and wrecks Black's kingside pawn structure. Recapture gxf6 creates doubled f-pawns — a permanent structural liability that echoes the plan's doubled f-pawn exploitation heuristic. Also removes a key defender near Black's king.. Rejected: d4a7, d4e5.
9. Commit Commit Bxf6 (d4f6).
42...Qxf6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d8f6
- stockfish_uci1005ms
43.Qxd6Sonnet
1. Observe Halbzug 43, Weiss am Zug. Phase: Endspiel. Schwarz +7 Punkte. Legale Zuege: 30. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Push c4-c5 to activate the queenside majority and threaten a passed pawn, forcing Black to react outside its short-range calculation. Engine-horizon blindness beyond 6 moves means slow queenside maneuveri…
- llm.plan67264ms · $0.0516
full reasoning
Phase: endgame. Push c4-c5 to activate the queenside majority and threaten a passed pawn, forcing Black to react outside its short-range calculation. Engine-horizon blindness beyond 6 moves means slow queenside maneuvering evades Black's tactical focus window. Trade toward a rook endgame where Philidor defensive technique neutralizes Black's piece surplus. Exploit the queenside pawn majority to generate a passed c-pawn; simplify toward a rook endgame and hold with Philidor's third-rank defense, or convert with Lucena bridge-building if the pawn advances far enough — canceling the two-minor-piece deficit through structural technique. Critical: Nf5 outpost is the most dangerous piece — can leap to d4 or h4; monitor c3 and g3 coverage at all times; Black's bishops on d6/g6 dominate open diagonals — do not open the a3-f8 diagonal or allow Bg6-h5 pin; White rooks must contest the c and e files actively to prevent Black rook penetration on d8 or e8; c4-c5 timing is critical — advance only when rooks support the push; a backward c-pawn would be fatal.
6. Candidates Candidates: c5 (Pawn structure heuristic: activates queenside majority directly per plan, threatens passed c-pawn. Both rooks on c1/e1 already support the push — timing is right.) | Qxd6 (Trade-only-when-you-gain heurist…
- chess.js.legal_moves0ms
- llm.candidates76321ms · $0.0627
full reasoning
Candidates: c5 (Pawn structure heuristic: activates queenside majority directly per plan, threatens passed c-pawn. Both rooks on c1/e1 already support the push — timing is right.) | Qxd6 (Trade-only-when-you-gain heuristic: eliminates Black's dominant d6 bishop and forces Qxd6 queen trade, simplifying toward the Philidor rook endgame the plan explicitly targets.) | Re5 (King safety heuristic: Re5 contests the e-file and shadows Nf5 — the plan flags it as most dangerous, capable of leaping to h4. Blocks Black rook penetration on e8.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Qxd6 — Trade-only-when-you-gain heuristic: eliminating Black's dominant d6 bishop forces Qxd6, simplifying toward the Philidor rook endgame the plan targets. Removes the a3-f8 diagonal threat and reduces Blac…
- llm.reflect11885ms · $0.0034
full reasoning
Final pick: Qxd6 — Trade-only-when-you-gain heuristic: eliminating Black's dominant d6 bishop forces Qxd6, simplifying toward the Philidor rook endgame the plan targets. Removes the a3-f8 diagonal threat and reduces Black's piece surplus immediately.. Rejected: c4c5, e1e5.
9. Commit Commit Qxd6 (d1d6).
44...Qxd6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f6d6
- stockfish_uci1024ms
45.c5Sonnet
1. Observe Halbzug 45, Weiss am Zug. Phase: Endspiel. Schwarz +13 Punkte. Legale Zuege: 23. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search10ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Continue c4-c5 push to create a passed queenside pawn, force Black to react defensively, then seek rook exchanges to neutralise the material deficit via simplified rook endgame technique. Convert queensid…
- llm.plan34479ms · $0.0185
full reasoning
Phase: endgame. Continue c4-c5 push to create a passed queenside pawn, force Black to react defensively, then seek rook exchanges to neutralise the material deficit via simplified rook endgame technique. Convert queenside pawn majority into a passed c-pawn, trade off Black's queen and minor pieces through forced simplification, and hold or convert with Philidor third-rank defence or Lucena bridge-building depending on which side holds the passed pawn. Critical: Black's Nf5 is a dominant outpost — centralised, covers key squares, cannot be traded cheaply; must not allow it to penetrate further; Black Qd6 controls the d-file and central diagonals — any rook activation on c/d-files must account for queen interception; Philidor heuristic applies: if a rook endgame is reached, White's defending rook must sit on the third rank until Black's passer reaches rank 6, then shift behind it — this is the priority defensive structure; Own weakness: White's king on g1 is temporarily safe but back-rank pressure via open e/c files is real if both White rooks drift; at least one rook must guard e1 or c1 against back-rank intrusions.
6. Candidates Candidates: c5 (Primary plan: creates passed queenside pawn, forces Black to react defensively; directly executes the c4-c5 push blueprint.) | Re3 (Philidor third-rank heuristic: rook on rank 3 is correct defensive struc…
- chess.js.legal_moves0ms
- llm.candidates43884ms · $0.0350
full reasoning
Candidates: c5 (Primary plan: creates passed queenside pawn, forces Black to react defensively; directly executes the c4-c5 push blueprint.) | Re3 (Philidor third-rank heuristic: rook on rank 3 is correct defensive structure; guards back-rank against Qd6/rook intrusion on c/e-files.) | Re4 (Active rook swings queenside after c5; contests d4 to limit Nf5 dominant-outpost penetration per plan's outpost warning.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: c5 — Directly executes the blueprint: creates passed queenside pawn, forces Black's Qd6 and pieces to react defensively. Per plan heuristic, pawn majority conversion is the primary winning method before rook …
- llm.reflect10068ms · $0.0030
full reasoning
Final pick: c5 — Directly executes the blueprint: creates passed queenside pawn, forces Black's Qd6 and pieces to react defensively. Per plan heuristic, pawn majority conversion is the primary winning method before rook simplification.. Rejected: e1e3, e1e4.
9. Commit Commit c5 (c4c5).
46...Qxc5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d6c5
- stockfish_uci1024ms
47.Re4Sonnet
1. Observe Halbzug 47, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 22. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search11ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Push c2-c4 to create a queenside passed pawn candidate, provoke Black to commit queen or knight defensively, then seek rook trades on the c-file or e-file to reduce Black's winning force toward a rook end…
- llm.plan36784ms · $0.0232
full reasoning
Phase: endgame. Push c2-c4 to create a queenside passed pawn candidate, provoke Black to commit queen or knight defensively, then seek rook trades on the c-file or e-file to reduce Black's winning force toward a rook endgame where Philidor defensive technique from memory becomes applicable. Survive the material deficit by simplifying into a rook endgame: force piece trades via active rook pressure, defend with Philidor third-rank method if Black advances a passed pawn, or bridge-build (Lucena) if White's c-pawn becomes the passed pawn — both memory heuristics point to this as the last realistic drawing fortress. Critical: Black Nf5 threatens Nh4 or Nd4-e2 forking rooks — must track knight at all times; Black Qc5 eyes f2 pawn — king safety on g1 is thin after any pawn advance; Own f2 weakness is exploitable if rooks leave the e1 post; keep Re1 covering e-file before any queenside push; Engine will defend every trick — do not expect queen overextension; rely on the engine-horizon gap (memory: slow queenside plans beat 6-move horizon engines).
6. Candidates Candidates: c4 (Executes the queenside passed pawn plan; memory heuristic: slow pawn advances beat engines with 6-move horizon.) | Re4 (Active rook covers e4, neutralises Nd4-e2 fork threat on both rooks; prepares Philid…
- chess.js.legal_moves0ms
- llm.candidates45798ms · $0.0319
full reasoning
Candidates: c4 (Executes the queenside passed pawn plan; memory heuristic: slow pawn advances beat engines with 6-move horizon.) | Re4 (Active rook covers e4, neutralises Nd4-e2 fork threat on both rooks; prepares Philidor rook endgame structure.) | h4 (King safety first: stops Nf5-h4 knight hop attacking g2; removes immediate kingside knight landing square.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Re4 — Re4 pre-empts Nd4-Ne2+ royal fork: rook on e4 can recapture Ne2 if knight leaps, neutralising material loss. Memory heuristic: fix active tactics before slow pawn plans. Plan mandates e-file coverage be…
- llm.reflect73280ms · $0.0580
full reasoning
Final pick: Re4 — Re4 pre-empts Nd4-Ne2+ royal fork: rook on e4 can recapture Ne2 if knight leaps, neutralising material loss. Memory heuristic: fix active tactics before slow pawn plans. Plan mandates e-file coverage before c4.. Rejected: c2c4, h3h4.
9. Commit Commit Re4 (e1e4).
48...Nd4stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f5d4
- stockfish_uci1004ms
49.Rxd4Sonnet
1. Observe Halbzug 49, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 28. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Neutralize the dual fork threats — Nf3+ Kh2 Nxe4 wins Re4 immediately; Ne2+ Kh2 Nxc1 wins Rc1 — by repositioning king or contesting d4 before advancing c4. Then trade aggressively on e- or c-file to reduc…
- llm.plan83626ms · $0.0585
full reasoning
Phase: endgame. Neutralize the dual fork threats — Nf3+ Kh2 Nxe4 wins Re4 immediately; Ne2+ Kh2 Nxc1 wins Rc1 — by repositioning king or contesting d4 before advancing c4. Then trade aggressively on e- or c-file to reduce Black's winning force and enter a Philidor-eligible rook ending. Survive the -14 deficit through maximum simplification: force piece trades into a pure rook endgame, then apply Philidor third-rank defense (memory heuristic 1) if Black advances a passed pawn — the only theoretically realistic drawing technique available. Critical: URGENT: Nf3+ Kh2 Nxe4 loses Re4 for free — this tactical threat must be resolved before any queenside plan; Ne2+ fork on Rc1 is a secondary but equally lethal trick from Nd4; Opponent heuristic 1 confirmed: engine will find every defensive and attacking resource — no blunder expected, so survival requires structurally sound simplification, not hope for tactical gifts.
6. Candidates Candidates: Rxd4 (captures n+centre score=4) | Re5 (centre score=1) | Re6 (development score=0) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Rxd4 — Rxd4 eliminates the Nd4 knight immediately, neutralizing both fork threats: Nf3+/Nxe4 and Ne2+/Nxc1. Yes, Qxd4 recaptures and White is materially down, but avoiding two free rooks lost is the only stru…
- llm.reflect52819ms · $0.0415
full reasoning
Final pick: Rxd4 — Rxd4 eliminates the Nd4 knight immediately, neutralizing both fork threats: Nf3+/Nxe4 and Ne2+/Nxc1. Yes, Qxd4 recaptures and White is materially down, but avoiding two free rooks lost is the only structurally sound choice.. Rejected: e4e5, e4e6.
9. Commit Commit Rxd4 (e4d4).
50...Rac8stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: a8c8
- stockfish_uci1006ms
51.Rd8Sonnet
1. Observe Halbzug 51, Weiss am Zug. Phase: Endspiel. Schwarz +11 Punkte. Legale Zuege: 31. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search6ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Defend or actively relocate Rd4 — the queen on c5 threatens Qxd4 immediately. Force a rook exchange via Rd8+ to strip one Black rook off the board, reduce to Queen+Rook vs two Rooks, then activate the kin…
- llm.plan51755ms · $0.0332
full reasoning
Phase: endgame. Defend or actively relocate Rd4 — the queen on c5 threatens Qxd4 immediately. Force a rook exchange via Rd8+ to strip one Black rook off the board, reduce to Queen+Rook vs two Rooks, then activate the king toward d3-e4 to build Philidor-eligible rook cover. Survive a -11 deficit through maximum simplification: trade both rooks for Black's two rooks if possible, reach a Q vs R+pawns fortress attempt or a pure rook ending where Philidor third-rank defense (memory heuristic 1) gives theoretical drawing chances. Critical: Qxd4 is the immediate threat — Rd4 must move or be protected this turn; Rd8+ forcing Rxd8 Rxd8+ achieves one forced rook trade but leaves White a full queen down; Opponent engine (memory: engine defense) will find all defensive resources — no blunder budget; King on g1 is passive and exposed to back-rank threats from Rc8/Rf8 battery; c2 and a2 pawns are long-term targets once Black's queen coordinates with rooks.
6. Candidates Candidates: Rd8 (Forces Rxd8 Rxd8+ rook trade as plan states; maximizes simplification per Philidor heuristic 1, escaping Qxd4 immediately.) | Rd3 (Philidor third-rank placement (heuristic 1 direct reference); escapes Qx…
- chess.js.legal_moves0ms
- llm.candidates92423ms · $0.0689
full reasoning
Candidates: Rd8 (Forces Rxd8 Rxd8+ rook trade as plan states; maximizes simplification per Philidor heuristic 1, escaping Qxd4 immediately.) | Rd3 (Philidor third-rank placement (heuristic 1 direct reference); escapes Qxd4, rook on rank 3 enables defensive Philidor shelter.) | Rd5 (Active rook centralization escapes queen attack; 5th-rank rook keeps pressure and delays Black coordination per engine-defense heuristic.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Rd8 — Forces Rxd8 Rxd8+ immediately trading one rook, reducing Black's firepower from two rooks to one. Escapes Qxd4 with a forced sequence, achieving maximum simplification per Philidor heuristic 1.. Rejecte…
- llm.reflect10880ms · $0.0031
full reasoning
Final pick: Rd8 — Forces Rxd8 Rxd8+ immediately trading one rook, reducing Black's firepower from two rooks to one. Escapes Qxd4 with a forced sequence, achieving maximum simplification per Philidor heuristic 1.. Rejected: d4d3, d4d5.
9. Commit Commit Rd8 (d4d8).
52...Rcxd8stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c8d8
- stockfish_uci1021ms
53.Re1Sonnet
1. Observe Halbzug 53, Weiss am Zug. Phase: Endspiel. Schwarz +16 Punkte. Legale Zuege: 15. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search13ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search6ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Activate the rook toward the 7th rank — Rc7 threatens b7 and keeps the rook from being a passive target. Simultaneously advance the king toward e2-d3 over 2-3 moves to support any passed-pawn creation on …
- llm.plan111955ms · $0.0809
full reasoning
Phase: endgame. Activate the rook toward the 7th rank — Rc7 threatens b7 and keeps the rook from being a passive target. Simultaneously advance the king toward e2-d3 over 2-3 moves to support any passed-pawn creation on the queenside. Do not exchange the rook for one Black rook: that leaves only pawns vs Q+R+B, which is instantly hopeless. The goal is to stay in a R-present position where Philidor third-rank defense (memory heuristic 1) at least offers a theoretical survival mechanism. With a -16 deficit the only realistic drawing path is slow queenside counterplay exploiting the engine-horizon heuristic (memory heuristic 5: 1320-rated engines miss 6-move plans) — march king to d3 while rook harrasses a7/b7, hope Black's queen has to return to defend, and if a single rook trades off, immediately adopt the Philidor third-rank stance with the remaining rook to neutralize any passed-pawn push. Critical: Qxf2+ immediately shatters White's king-side pawn cover and opens the g1 king to back-rank threats — must be calculated before any rook move; Rc7 looks active but if queen recaptures on c7 White loses the rook outright — verify no queen guard on c7 first; White's isolated pawns on a2 and c2 are soft targets; queen can infiltrate via d4 or b4 forcing pawn losses before the king centralizes.
6. Candidates Candidates: Re1 (Centralizes rook; prepares Re7 to reach 7th rank since Rc7 is blocked by queen on c5. Heuristic 1: positions rook for Philidor third-rank stance.) | Kf1 (Starts the king march toward e2-d3 as planned. He…
- chess.js.legal_moves0ms
- llm.candidates32728ms · $0.0245
full reasoning
Candidates: Re1 (Centralizes rook; prepares Re7 to reach 7th rank since Rc7 is blocked by queen on c5. Heuristic 1: positions rook for Philidor third-rank stance.) | Kf1 (Starts the king march toward e2-d3 as planned. Heuristic 5: slow king centralization exploits engine horizon on queenside counterplay.) | c4 (Queenside pawn advance creates counterplay target on c-file. Heuristic 5: 6-move queenside plan 1320 engine may miss; fixes soft c2 pawn weakness.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Re1 — Rc7 loses the rook immediately to Qxc7 (queen guards c7). Re1 prepares Re7 reaching the 7th rank to attack f7/h7, aligning with Philidor heuristic 1 rook-activity while dodging the queen-interception tr…
- llm.reflect32877ms · $0.0214
full reasoning
Final pick: Re1 — Rc7 loses the rook immediately to Qxc7 (queen guards c7). Re1 prepares Re7 reaching the 7th rank to attack f7/h7, aligning with Philidor heuristic 1 rook-activity while dodging the queen-interception trap.. Rejected: g1f1, c2c4.
9. Commit Commit Re1 (c1e1).
54...Bxc2stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: g6c2
- stockfish_uci1009ms
55.Kf1Sonnet
1. Observe Halbzug 55, Weiss am Zug. Phase: Endspiel. Schwarz +17 Punkte. Legale Zuege: 20. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search8ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Neutralize the immediate Qxf2+ back-rank threat before executing the rook-to-7th plan. Once f2 is stable, drive the rook to e7 or c7 to target b7 and force Black to coordinate Q+R+B precisely. King must s…
- llm.plan69748ms · $0.0511
full reasoning
Phase: endgame. Neutralize the immediate Qxf2+ back-rank threat before executing the rook-to-7th plan. Once f2 is stable, drive the rook to e7 or c7 to target b7 and force Black to coordinate Q+R+B precisely. King must step toward f1-e2 to escape the Bc2 pin on the d1-b1 diagonal over 2-3 moves. Survive through Philidor-style active rook defense (memory heuristic: rook stays on the 3rd rank until pawn crosses the 6th, then retreats to the 1st for checks), while pushing the a-pawn as a queenside distraction that exploits the engine's horizon limit beyond 6 moves (memory heuristic: slow cross-board plans outrun a 1320 engine's search). Critical: Qxf2+ is a near-immediate threat — after Kxf2, Black gains Rd2+ with overwhelming tempo and back-rank mating nets; Bc2 controls d1 and b1, cutting off White king's escape routes and making rook-exchange fatal; White must not trade the rook passively — any rook exchange must yield a Philidor drawing setup or queenside pawn race, not just simplification into Q+R vs pawns.
6. Candidates Candidates: Kf1 (Steps toward f1-e2 per plan; breaks Bc2 d1-b1 diagonal grip; reduces Qxf2+ back-rank mating nets.) | Re7 (Executes rook-to-7th plan; attacks b7 and f7 simultaneously, forcing Black to coordinate defensiv…
- chess.js.legal_moves0ms
- llm.candidates51408ms · $0.0433
full reasoning
Candidates: Kf1 (Steps toward f1-e2 per plan; breaks Bc2 d1-b1 diagonal grip; reduces Qxf2+ back-rank mating nets.) | Re7 (Executes rook-to-7th plan; attacks b7 and f7 simultaneously, forcing Black to coordinate defensively.) | a4 (Memory heuristic 2: slow queenside pawn plan exceeds 1320 engine horizon; a-pawn distraction buys tempo.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kf1 — King safety first: Kf1 breaks the Bc2 pin on the d1-b1 diagonal and eliminates Qxf2+ back-rank mating nets. Only then can Re7 be executed safely without Rd2+ tempo refutations.. Rejected: e1e7, a2a4.
- llm.reflect9414ms · $0.0032
9. Commit Commit Kf1 (g1f1).
56...Qb5+stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c5b5
- stockfish_uci1007ms
57.Kg1Sonnet
1. Observe Halbzug 57, Weiss am Zug. Phase: Endspiel. Schwarz +17 Punkte. Legale Zuege: 2. Schach! Criticality: 0.45.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. White is in check (Qb5 diagonal b5–e2–f1). With only 2 legal moves — Re1-e2 (block) or Kg1 (escape) — priority is to resolve the check without further weakening. After check resolution, activate the rook …
- llm.plan58730ms · $0.0405
full reasoning
Phase: endgame. White is in check (Qb5 diagonal b5–e2–f1). With only 2 legal moves — Re1-e2 (block) or Kg1 (escape) — priority is to resolve the check without further weakening. After check resolution, activate the rook toward the 7th rank and push a2–a4–a5 as a queenside distraction that exploits the engine's horizon limit (memory: engine-horizon beyond 6 moves). Rook stays on the 3rd rank per Philidor heuristic until pawns advance. Survive the immediate check via the less costly legal move, then use the a-pawn as a tempo-gaining distraction on the queenside while keeping the rook maximally active — the only realistic survival strategy against Black's +17 material edge. Critical: White king is in check from Qb5 (diagonal b5–c4–d3–e2–f1) — must be resolved this move; Only 2 legal moves exist: Re1-e2 (block, but rook may become exposed) or Kg1 (king escapes, f2-pawn remains vulnerable); Bc2 controls d1–b1 diagonal, boxing in White king options on queenside; Black Rf8 on f-file threatens Rxf2 ideas once king leaves f1; a2-pawn is White's sole counterplay — must advance quickly to create a horizon-exploiting diversion.
6. Candidates Candidates: Kg1 (King escapes check; king safety first heuristic — rook stays unblocked for future 7th-rank activation.) | Re2 (Blocks check with rook; trade only when you gain — rook on e2 can pivot to a2 supporting paw…
- chess.js.legal_moves0ms
- llm.candidates9593ms · $0.0037
full reasoning
Candidates: Kg1 (King escapes check; king safety first heuristic — rook stays unblocked for future 7th-rank activation.) | Re2 (Blocks check with rook; trade only when you gain — rook on e2 can pivot to a2 supporting pawn advance.) | Kg1 (Patience over panic: king to g1 preserves f2-pawn defense and keeps rook free for queenside counterplay.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kg1 — King escapes check without blocking the rook. Per 'king safety first': Kg1 preserves f2-pawn cover, keeps Re1 free for 7th-rank activation or a2-support, avoiding the Re2 trap where rook becomes a stati…
- llm.reflect9392ms · $0.0028
full reasoning
Final pick: Kg1 — King escapes check without blocking the rook. Per 'king safety first': Kg1 preserves f2-pawn cover, keeps Re1 free for 7th-rank activation or a2-support, avoiding the Re2 trap where rook becomes a static blocker exposed to Bc2-b3 skewer ideas.. Rejected: e1e2.
9. Commit Commit Kg1 (f1g1).
58...Qb1stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: b5b1
- stockfish_uci1023ms
59.Rxb1Sonnet
1. Observe Halbzug 59, Weiss am Zug. Phase: Endspiel. Schwarz +17 Punkte. Legale Zuege: 14. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search13ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search8ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. The rook on e1 is immediately hanging to Qb1xe1 — saving it is move-one priority. Re1 to an active square (ideally Re8+ forcing Kg8-h8 and disrupting the f8-rook pair) buys tempo. Once the rook survives, …
- llm.plan78261ms · $0.0619
full reasoning
Phase: endgame. The rook on e1 is immediately hanging to Qb1xe1 — saving it is move-one priority. Re1 to an active square (ideally Re8+ forcing Kg8-h8 and disrupting the f8-rook pair) buys tempo. Once the rook survives, advance a2-a4-a5 as a queenside distraction and push rook checks to force Black to solve two threats simultaneously beyond 6 moves. Exploit the engine-horizon heuristic (memory: engines below 1500 miss plans beyond 6 moves) by maturing a passed a-pawn while using rook checks on the 8th rank to delay Black's queen-rook-bishop coordination — the only realistic survival path given the -17 material deficit. Critical: Rook e1 is immediately under attack from Qb1 along rank 1 — c1 and d1 are both empty, Qxe1 wins the rook for free if White does not move it; Philidor heuristic (memory): passive rook defense is structurally sound but inapplicable here — the material deficit demands active rook counterplay on the 7th/8th rank, not the 3rd rank; Black owns queen, two rooks, and bishop — no tactical shots exist for White; only maximally active rook play plus a-pawn distraction delays the engine long enough to survive past its horizon.
6. Candidates Candidates: Rxb1 (Captures the queen immediately — Philidor heuristic demands active rook counterplay over passive waiting; trades rook for queen, shrinking the -17 deficit.) | a4 (Queenside a-pawn distraction per plan; …
- chess.js.legal_moves0ms
- llm.candidates103872ms · $0.0901
full reasoning
Candidates: Rxb1 (Captures the queen immediately — Philidor heuristic demands active rook counterplay over passive waiting; trades rook for queen, shrinking the -17 deficit.) | a4 (Queenside a-pawn distraction per plan; engines below 1500 miss plans beyond 6 moves — forces Black to allocate rook to stop the passer.) | h4 (Creates a secondary kingside passer threat; splits Black's defensive attention across two flanks to exploit engine-horizon blind spot.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Rxb1 — Queen on b1 hangs the rook on e1 — Rxb1 forces Bxb1, trading rook for queen and shrinking the material deficit by ~4 points. Any other move loses the rook for free, deepening the hole irreparably.. Rej…
- llm.reflect30752ms · $0.0214
full reasoning
Final pick: Rxb1 — Queen on b1 hangs the rook on e1 — Rxb1 forces Bxb1, trading rook for queen and shrinking the material deficit by ~4 points. Any other move loses the rook for free, deepening the hole irreparably.. Rejected: a2a4, h3h4.
9. Commit Commit Rxb1 (e1b1).
60...Bxb1stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c2b1
- stockfish_uci1004ms
61.a4Sonnet
1. Observe Halbzug 61, Weiss am Zug. Phase: Endspiel. Schwarz +13 Punkte. Legale Zuege: 10. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Immediate priority: the bishop on b1 directly attacks a2 — the pawn must advance this move. Push a-pawn as far and fast as possible (a4 over a3 for maximum speed) while centralizing the king to support th…
- llm.plan69267ms · $0.0505
full reasoning
Phase: endgame. Immediate priority: the bishop on b1 directly attacks a2 — the pawn must advance this move. Push a-pawn as far and fast as possible (a4 over a3 for maximum speed) while centralizing the king to support the promotion march. Per the Opposition heuristic from memory: king must contest key squares on the a-file path (c2–b3 ideally) to shield the pawn from bishop interference. Race the a-pawn to promotion as White's only realistic counterplay; exploit the engine-horizon heuristic (memory) by building a 7-move plan — a4-a5-a6-a7-a8=Q — whose full coordination cost for Black (rooks + bishop triangulating) exceeds what a 1320 engine calculates cleanly. Stalemate traps on g1/h1 are secondary insurance if Black converges pieces carelessly. Critical: Bishop b1 attacks a2 — pawn is hanging and must move immediately (a3 or a4); Black's rooks on d8/f8 can interpose or back-rank the White king in 1–2 moves; king must avoid passivity; White has no rook and cannot use Philidor/Lucena technique; king must do the defensive leg-work the rook would normally provide in a-pawn support.
6. Candidates Candidates: h4 (development score=0) | a3 (development score=0) | a4 (development score=0) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: a4 — Bishop b1 attacks a2 — pawn must escape immediately. a4 jumps two squares, launching the a4-a5-a6-a7-a8=Q promotion race at maximum speed; bishop on b1 cannot re-attack a4 without a long repositioning de…
- llm.reflect20901ms · $0.0147
full reasoning
Final pick: a4 — Bishop b1 attacks a2 — pawn must escape immediately. a4 jumps two squares, launching the a4-a5-a6-a7-a8=Q promotion race at maximum speed; bishop on b1 cannot re-attack a4 without a long repositioning detour.. Rejected: h3h4, a2a3.
9. Commit Commit a4 (a2a4).
62...Rfe8stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f8e8
- stockfish_uci1006ms
63.a5Sonnet
1. Observe Halbzug 63, Weiss am Zug. Phase: Endspiel. Schwarz +13 Punkte. Legale Zuege: 9. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Push a-pawn to a5 immediately — every tempo is critical. Then escort king via f1-e2-d2-c3-b4 (not through d3, bishop-controlled). Per the opposition heuristic from memory: king must contest a5–b5–c6 path …
- llm.plan94411ms · $0.0673
full reasoning
Phase: endgame. Push a-pawn to a5 immediately — every tempo is critical. Then escort king via f1-e2-d2-c3-b4 (not through d3, bishop-controlled). Per the opposition heuristic from memory: king must contest a5–b5–c6 path squares to shield the pawn and force rook coordination cost on Black. Kingside pawns are passive and irrelevant for now. Race the a-pawn to a8=Q as White's only realistic resource; exploit the engine-horizon memory hit — Black's 1320-rated engine may not fully calculate a 7-move coordinated king-march + pawn-advance plan, so set up the full promotion sequence (a5-a6-a7-a8=Q with king arriving at b6) whose defensive coordination cost exceeds its search horizon. Critical: Black rooks will converge on a-file within 1-2 moves (Rd1+ or Ra8 blockade) — zero passive kingside pawn moves allowed, every White move must serve king-escort or pawn-march; Bishop on b1 controls c2 and d3 — king route must avoid d3 entirely and travel via e2-d2-c3-b4 to stay off the bishop diagonal without losing tempi; Per the Lucena memory hit: bridge-building to escort a passed pawn to promotion requires king proximity (target b5 by move 35); without that, a single Black rook on a8 holds forever against the a-pawn alone.
6. Candidates Candidates: a5 (Critical pawn-march tempo; every move must serve promotion. Black rooks converge on a-file — no delay tolerated.) | Kf1 (First step of king escort route f1-e2-d2-c3-b4; avoids bishop-controlled d3 diagona…
- chess.js.legal_moves0ms
- llm.candidates24244ms · $0.0177
full reasoning
Candidates: a5 (Critical pawn-march tempo; every move must serve promotion. Black rooks converge on a-file — no delay tolerated.) | Kf1 (First step of king escort route f1-e2-d2-c3-b4; avoids bishop-controlled d3 diagonal per Lucena proximity heuristic.) | h4 (Fixes h-pawn to deny Black g4-g3 counterplay; prevents kingside distraction while king marches queenside.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: a5 — Every tempo is critical: a5 immediately starts the promotion race. Black rooks need 2+ moves to reach a8; delaying king escort by one move is cheaper than losing a pawn-march tempo in a 7-move promotion …
- llm.reflect9921ms · $0.0027
full reasoning
Final pick: a5 — Every tempo is critical: a5 immediately starts the promotion race. Black rooks need 2+ moves to reach a8; delaying king escort by one move is cheaper than losing a pawn-march tempo in a 7-move promotion sequence.. Rejected: g1f1, h3h4.
9. Commit Commit a5 (a4a5).
64...Rd2stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d8d2
- stockfish_uci1004ms
65.a6Sonnet
1. Observe Halbzug 65, Weiss am Zug. Phase: Endspiel. Schwarz +13 Punkte. Legale Zuege: 9. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Advance a-pawn immediately to force Black's rooks to commit queenside. King march must route via f1-e2-e3-d4-c5-b6, strictly skirting bishop-controlled d3 and e4. Target: White king on b6 sheltering pawn …
- llm.plan102931ms · $0.0814
full reasoning
Phase: endgame. Advance a-pawn immediately to force Black's rooks to commit queenside. King march must route via f1-e2-e3-d4-c5-b6, strictly skirting bishop-controlled d3 and e4. Target: White king on b6 sheltering pawn on a7, then build the Lucena bridge — per the Lucena memory heuristic, once king stands in front of the queening pawn, bridge-building becomes the winning method and forces Black's rook to rank-1 defense. Race the a-pawn to a8=Q by achieving a Lucena-like position (king on b7, rook shielding), exploiting the engine-horizon memory hit — the 1320 engine cannot calculate a 7-move king-march + pawn-advance coordination beyond its search depth, making the queenside sprint viable despite Black's overwhelming material advantage. Critical: Black Re8-a8 stops the a-pawn in a single move — timing of advance is critical and must coincide with a king tempo that ties Black's rooks to other duties; Bishop on b1 controls d3 and e4, adding 2-3 extra king-march tempi via the e3-d4 detour; Black Rd2 can swing to a2 and attack the pawn from behind at any moment — Philidor-style rook-behind-passed-pawn defense is exactly what Black will execute; White has zero fallback resource — if the a-pawn is neutralized, the position is a technical loss with no counterplay remaining.
6. Candidates Candidates: a6 (Heuristic 1: advance a-pawn immediately, forcing Black rooks to commit queenside before Ra2 Philidor defense is set up.) | Kf1 (Heuristic 2: first step of the mandatory f1-e2-e3-d4-c5-b6 king march; bisho…
- chess.js.legal_moves0ms
- llm.candidates30245ms · $0.0216
full reasoning
Candidates: a6 (Heuristic 1: advance a-pawn immediately, forcing Black rooks to commit queenside before Ra2 Philidor defense is set up.) | Kf1 (Heuristic 2: first step of the mandatory f1-e2-e3-d4-c5-b6 king march; bishop on b1 blocks d3/e4 forcing this detour.) | h4 (Creates a second queenside-distracting pawn front; forces Black rook to choose between a2 and kingside duty.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: a6 — Creates immediate axb7-b8=Q threat (heuristic 1): forces Black rooks to commit queenside NOW before Ra2 Philidor defense is set. If Black ignores it, White queens by capturing the b7 pawn. King march fol…
- llm.reflect107514ms · $0.0892
full reasoning
Final pick: a6 — Creates immediate axb7-b8=Q threat (heuristic 1): forces Black rooks to commit queenside NOW before Ra2 Philidor defense is set. If Black ignores it, White queens by capturing the b7 pawn. King march follows once Black is tied down.. Rejected: g1f1, h3h4.
9. Commit Commit a6 (a5a6).
66...Re1+stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: e8e1
- stockfish_uci1005ms
67.Kh2Sonnet
1. Observe Halbzug 67, Weiss am Zug. Phase: Endspiel. Schwarz +13 Punkte. Legale Zuege: 1. Schach! Criticality: 0.45.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search4ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Execute the single legal king move to escape check, then shelter behind the f/g/h pawn cluster. The Lucena bridge plan (memory heuristic: lucena rook) is permanently closed — Black's a7 pawn blocks the a6…
- llm.plan94430ms · $0.0789
full reasoning
Phase: endgame. Execute the single legal king move to escape check, then shelter behind the f/g/h pawn cluster. The Lucena bridge plan (memory heuristic: lucena rook) is permanently closed — Black's a7 pawn blocks the a6 pawn from ever queening. Pivot entirely to stalemate hunting and making Black's mating procedure as slow as possible over the next 3-5 moves. Accept that the Lucena queening path is gone; Black has effectively applied the Philidor-defense principle (memory heuristic: philidor rook) by dominating ranks 1–2 with rooks to seal the queening file — White's only survival route is to reach stalemate with the king sheltered behind the kingside pawn cluster. Critical: Black rook on e1 delivers check with exactly one legal White reply — no choice, no preparation needed; a6 pawn permanently blocked by Black's a7 pawn: abandon all Lucena queening calculation immediately; Black rooks on d2 and e1 plus bishop on b1 constitute a near-mating net — every Black move tightens it; Kingside pawns f2/g2/h3 are the sole shelter and stalemate bait — do not advance them carelessly.
6. Candidates Candidates: Kh2 (Only legal move — escapes Re1 check, shelters behind f2/g2/h3 pawn cluster per Philidor shelter heuristic.) | Kh2 (King safety first: h2 is the sole refuge behind kingside pawns; stalemate bait preserved…
- chess.js.legal_moves0ms
- llm.candidates10588ms · $0.0039
full reasoning
Candidates: Kh2 (Only legal move — escapes Re1 check, shelters behind f2/g2/h3 pawn cluster per Philidor shelter heuristic.) | Kh2 (King safety first: h2 is the sole refuge behind kingside pawns; stalemate bait preserved per Lucena-closed plan.) | Kh2 (Forced by check; Philidor rook domination of ranks 1–2 confirmed — only survival is pawn-cluster shelter on h2.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kh2 — Forced — Re1 check allows exactly one legal reply. Kh2 shelters behind f2/g2/h3 cluster per Philidor shelter heuristic; stalemate bait preserved with kingside pawns intact.. Rejected: g1h2.
- llm.reflect8380ms · $0.0023
9. Commit Commit Kh2 (g1h2).
68...bxa6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: b7a6
- stockfish_uci1005ms
69.Kg3Sonnet
1. Observe Halbzug 69, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 6. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Step king to g3 — the only forward square not controlled by Black's rook pair. The e1 rook seals g1 and h1 (philidor rook: Black dominates ranks 1-2 exactly as that heuristic prescribes for the stronger s…
- llm.plan92883ms · $0.0741
full reasoning
Phase: endgame. Step king to g3 — the only forward square not controlled by Black's rook pair. The e1 rook seals g1 and h1 (philidor rook: Black dominates ranks 1-2 exactly as that heuristic prescribes for the stronger side). From g3, keep f2/g2/h3 pawn triplet unadvanced as long as possible: each pawn push surrenders a potential stalemate square. The lucena bridge is permanently closed — White has no passed pawn, and the rook pair plus bishop give Black a tablebase-level win; White's only survival path is to shelter behind the f/g/h pawn island and manufacture a stalemate trap once Black begins stripping those pawns. Critical: e1 rook seals g1 and h1 — Kg3 is the sole non-losing king move; d2 rook will slide laterally to cut off king after Kg3 — anticipate a h2-cutoff threat; Black a6/a7 pawn pair will queen unopposed once rooks mop up White pawns — no counter-queenside play exists; Stalemate window opens only if Black captures all three pawns carelessly with king already stalemated in corner — requires Black error, not plan execution.
6. Candidates Candidates: Kg3 (King safety first: e1 rook seals g1/h1; g3 is the only square escaping ranks 1-2 prison.) | h4 (Heuristic: advance h-pawn to probe stalemate trap, but risks surrendering a shelter square early.) | f3 (Ke…
- chess.js.legal_moves0ms
- llm.candidates37418ms · $0.0286
full reasoning
Candidates: Kg3 (King safety first: e1 rook seals g1/h1; g3 is the only square escaping ranks 1-2 prison.) | h4 (Heuristic: advance h-pawn to probe stalemate trap, but risks surrendering a shelter square early.) | f3 (Keeps pawn island intact slightly longer; stalemate window heuristic says delay pawn dissolution.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kg3 — King safety first: e1 rook seals g1/h1, making g3 the only escape from the back-rank prison. Staying on h2 allows Rd1-h1# or Rh2 trapping sequences immediately.. Rejected: h3h4, f2f3.
- llm.reflect13572ms · $0.0029
9. Commit Commit Kg3 (h2g3).
70...Bf5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: b1f5
- stockfish_uci1006ms
71.Kh2Sonnet
1. Observe Halbzug 71, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Hold king on g3 behind the f2/g2/h3 pawn triplet; resist all forced pawn pushes; maneuver toward a stalemate pocket where neither rook can capture without leaving White with zero legal moves. Every pawn a…
- llm.plan57451ms · $0.0432
full reasoning
Phase: endgame. Hold king on g3 behind the f2/g2/h3 pawn triplet; resist all forced pawn pushes; maneuver toward a stalemate pocket where neither rook can capture without leaving White with zero legal moves. Every pawn advance surrenders one shelter square — hold all three as long as possible. Manufacture a stalemate trap by clustering king and all three pawns into a corner configuration, exploiting the engine-horizon gap (1320 engine misses plans materializing beyond 6 moves) to set the stalemate net before Black's pieces coordinate for a clean technical conversion. Critical: Rook on d2 attacks f2 and g2 directly — if either pawn falls, the pawn shelter collapses and stalemate chances vanish; Philidor rook heuristic applies in reverse here: Black's rooks dominate ranks 1-2 exactly as Philidor prescribes for the stronger side, sealing our king above rank 2; White must stay on rank 3 and resist being pushed further; Bishop f5 controls h3/g4 diagonal exits, confining king to g3-f3-h2 triangle; Lucena bridge is permanently closed (no passed pawn), so there is no winning technique available to White — only stalemate salvation remains.
6. Candidates Candidates: Kh2 (Enters the plan's g3-f3-h2 triangle; clusters king with f2/g2/h3 pawns toward corner stalemate pocket.) | Kf3 (Stays on rank 3 (Philidor reverse heuristic); directly guards f2 pawn targeted by Rd2 — shel…
- chess.js.legal_moves0ms
- llm.candidates70278ms · $0.0493
full reasoning
Candidates: Kh2 (Enters the plan's g3-f3-h2 triangle; clusters king with f2/g2/h3 pawns toward corner stalemate pocket.) | Kf3 (Stays on rank 3 (Philidor reverse heuristic); directly guards f2 pawn targeted by Rd2 — shelter must not collapse.) | Kh4 (Heuristic suggestion; sidesteps Rd2×f2/g2 threat while bishop f5 diagonal pressure on g4 is bypassed via h4.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kh2 — Kh2 clusters king into the f2/g2/h3 stalemate pocket. Bishop f5 controls g4, so h4 is actually dangerous. Kh2 stays behind all three pawns, maximizing stalemate geometry against the 1320 engine.. Reject…
- llm.reflect9848ms · $0.0037
full reasoning
Final pick: Kh2 — Kh2 clusters king into the f2/g2/h3 stalemate pocket. Bishop f5 controls g4, so h4 is actually dangerous. Kh2 stays behind all three pawns, maximizing stalemate geometry against the 1320 engine.. Rejected: g3f3, g3h4.
9. Commit Commit Kh2 (g3h2).
72...h6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: h7h6
- stockfish_uci1005ms
73.Kg3Sonnet
1. Observe Halbzug 73, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 6. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Halbzug 73, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 6. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend proph…
full reasoning
Phase: endgame. Halbzug 73, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 6. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend prophylactically. [LLM-Error: Claude CLI subprocess timed out after 120000ms]
6. Candidates Candidates: Kg3 (Memory heuristic 1: activate the king. Centralizing king supports all three pawns and contests f4/h4 squares.) | h4 (Memory heuristic 2: create passed pawns. Advances most forward pawn toward promotion; …
- chess.js.legal_moves0ms
- llm.candidates46803ms · $0.0310
full reasoning
Candidates: Kg3 (Memory heuristic 1: activate the king. Centralizing king supports all three pawns and contests f4/h4 squares.) | h4 (Memory heuristic 2: create passed pawns. Advances most forward pawn toward promotion; bishop on f5 does not cover h-file.) | f4 (Prophylactic pawn advance stakes space, makes a passed pawn candidate, and limits Black rook on d2 lateral scope.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kg3 — Memory heuristic 1: activate the king. Centralizing king supports all three pawns and contests f4/h4 squares.. Rejected: h3h4, f2f4. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Kg3 (h2g3).
74...Kg7stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: g8g7
- stockfish_uci1022ms
75.Kf4Sonnet
1. Observe Halbzug 75, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Halbzug 75, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend proph…
full reasoning
Phase: endgame. Halbzug 75, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend prophylactically. [LLM-Error: Claude CLI subprocess timed out after 120000ms]
6. Candidates Candidates: Kf4 (Activate the king toward center; heuristic #1 confirms this. Avoids h-file passivity, pressures f5-bishop.) | f3 (Creates passed pawn potential; plan says 'create passed pawns'. Restricts Black rook entr…
- chess.js.legal_moves0ms
- llm.candidates10109ms · $0.0037
full reasoning
Candidates: Kf4 (Activate the king toward center; heuristic #1 confirms this. Avoids h-file passivity, pressures f5-bishop.) | f3 (Creates passed pawn potential; plan says 'create passed pawns'. Restricts Black rook entry on f2.) | Kf3 (King activation toward center per memory heuristic; defends f2/g2 prophylactically against double-rook threats.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kf4 — Heuristic #1: king activation toward center. Kf4 attacks Bf5 directly, forcing Black to spend a tempo retreating the bishop rather than coordinating rooks. Most active try in a lost position.. Rejected:…
- llm.reflect42261ms · $0.0301
full reasoning
Final pick: Kf4 — Heuristic #1: king activation toward center. Kf4 attacks Bf5 directly, forcing Black to spend a tempo retreating the bishop rather than coordinating rooks. Most active try in a lost position.. Rejected: f2f3, g3f3.
9. Commit Commit Kf4 (g3f4).
76...Bh7stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f5h7
- stockfish_uci1023ms
77.Kg3Sonnet
1. Observe Halbzug 77, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Halbzug 77, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend proph…
full reasoning
Phase: endgame. Halbzug 77, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend prophylactically. [LLM-Error: Claude CLI subprocess timed out after 120000ms]
6. Candidates Candidates: Kf3 (Activates king centrally (heuristic: king activation), defends f2 pawn, reduces rook check threats from e1.) | Kg3 (King moves toward pawn cluster on g2/h3 (heuristic: activate king), covers g2 and h3, p…
- chess.js.legal_moves0ms
- llm.candidates35423ms · $0.0256
full reasoning
Candidates: Kf3 (Activates king centrally (heuristic: king activation), defends f2 pawn, reduces rook check threats from e1.) | Kg3 (King moves toward pawn cluster on g2/h3 (heuristic: activate king), covers g2 and h3, prophylactic defense.) | g4 (Creates passed pawn candidate (heuristic: create passed pawns), forces Black to react to advancing g/h pawn mass.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kg3 — Kg3 activates the king (memory heuristic 1) while prophylactically covering g2 and h3 (memory heuristic 3). Unlike Kf3, avoids Rxf2+ losing f2 with tempo; unlike g4, avoids Re4+ displacing king while Bl…
- llm.reflect91426ms · $0.0699
full reasoning
Final pick: Kg3 — Kg3 activates the king (memory heuristic 1) while prophylactically covering g2 and h3 (memory heuristic 3). Unlike Kf3, avoids Rxf2+ losing f2 with tempo; unlike g4, avoids Re4+ displacing king while Black wins the advanced pawn.. Rejected: f4f3, g2g4.
9. Commit Commit Kg3 (f4g3).
78...f6stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f7f6
- stockfish_uci1005ms
79.Kf4Sonnet
1. Observe Halbzug 79, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 8. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search10ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Activate the king toward the center, try to advance the g- or f-pawn out of the second rank where both black rooks dominate, and create the maximum friction before conceding. No speculative sacrifice — fi…
- llm.plan53278ms · $0.0380
full reasoning
Phase: endgame. Activate the king toward the center, try to advance the g- or f-pawn out of the second rank where both black rooks dominate, and create the maximum friction before conceding. No speculative sacrifice — find the most stubborn defensive try. With Black holding a +14 material edge and two rooks controlling ranks 1 and 2, White's only realistic plan is to keep the king active and push connected central pawns forward, referencing the opposition heuristic: if all heavy pieces somehow leave, king + pawn opposition becomes the last resource. The engine-horizon pattern suggests Black's 1320 engine may miscalculate a slow multi-step pawn advance beyond 6 moves — set up f2-f3-f4 as a slow march while the opponent reorganizes rooks. Critical: Black rook on d2 directly attacks f2 and g2 — these pawns cannot be abandoned passively; Black rook on e1 sits behind White's entire pawn structure, ready to mop up; King on g3 must not be cut off from supporting the f- and g-pawns; Philidor heuristic applies in reverse: White is the defender with no rook — cannot use Philidor technique, but its lesson (hold the third rank) means keep the king on rank 3 as long as possible to stay in front of own pawns; Opposition heuristic is the endgame anchor: if pawns advance, king must maintain proximity to them so any trade-down scenario keeps K+P opposition viable; Black's bishop on h7 is passive for now — any pawn advance on the kingside activates it instantly.
6. Candidates Candidates: Kf3 (Holds rank 3 (Philidor heuristic): king stays in front of own f/g pawns, blocking rook mop-up from e1.) | f3 (Initiates the f2-f3-f4 slow march plan; pawn leaves rank 2, escaping d2 rook's direct pressur…
- chess.js.legal_moves0ms
- llm.candidates26264ms · $0.0193
full reasoning
Candidates: Kf3 (Holds rank 3 (Philidor heuristic): king stays in front of own f/g pawns, blocking rook mop-up from e1.) | f3 (Initiates the f2-f3-f4 slow march plan; pawn leaves rank 2, escaping d2 rook's direct pressure.) | Kf4 (Most active king move toward center; maintains opposition proximity to f/g pawns per endgame anchor heuristic.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kf4 — King advances to f4, directly in front of f2/g2 pawns (opposition heuristic: king must lead pawns), escapes rook battery on rank 3, and cuts off Black's king from supporting a queenside breakthrough.. R…
- llm.reflect10480ms · $0.0032
full reasoning
Final pick: Kf4 — King advances to f4, directly in front of f2/g2 pawns (opposition heuristic: king must lead pawns), escapes rook battery on rank 3, and cuts off Black's king from supporting a queenside breakthrough.. Rejected: g3f3, f2f3.
9. Commit Commit Kf4 (g3f4).
80...h5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: h6h5
- stockfish_uci1021ms
81.Kg3Sonnet
1. Observe Halbzug 81, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 6. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search13ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Referencing the opposition heuristic: keep the king centralized on f4/f3 — the only active piece White has. Advance g2-g3 or f2-f3 to lift the pawn cluster off rank 2, denying Black's rooks a static targe…
- llm.plan104903ms · $0.0834
full reasoning
Phase: endgame. Referencing the opposition heuristic: keep the king centralized on f4/f3 — the only active piece White has. Advance g2-g3 or f2-f3 to lift the pawn cluster off rank 2, denying Black's rooks a static target. In 3-5 moves: force Black to find precise rook coordination before every pawn drops, exploiting the 1320-engine horizon gap on plans longer than 4 moves. Invoking Philidor knowledge: Black will use rank-1/2 rook dominance to escort the a-pawn forward; White must keep the king mobile enough to contest that march while advancing f/g pawns as far as possible to maximize moves-to-conversion and induce engine miscalculation beyond its search depth. Critical: Both black rooks control ranks 1 and 2 completely — king retreat is impossible, forward king activity is mandatory; Black's a6/a7 pawn chain becomes a decisive passer the moment rooks coordinate on an open file; White's only friction source: the connected f2/g2/h3 pawn cluster — advancing g2-g3 or f2-f3 buys tempo and challenges Black's static rook placement on d2 and e1.
6. Candidates Candidates: Kg3 (King centralizes toward g3/f3, mandatory forward activity per Philidor — retreat impossible with rooks on d2/e1.) | g3 (Advances pawn cluster off rank 2, denying Black's rook on d2 a static target; buys …
- chess.js.legal_moves0ms
- llm.candidates11006ms · $0.0037
full reasoning
Candidates: Kg3 (King centralizes toward g3/f3, mandatory forward activity per Philidor — retreat impossible with rooks on d2/e1.) | g3 (Advances pawn cluster off rank 2, denying Black's rook on d2 a static target; buys tempo per plan.) | f3 (Lifts f-pawn, challenging Black's rank-2 dominance and extending moves-to-conversion to exploit engine horizon.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kg3 — King must stay centralized and active — retreat is impossible with rooks on d2/e1. Kg3 centralizes toward f3/g3 per Philidor, keeps king mobile to contest a-pawn march, and avoids giving Black a tempo t…
- llm.reflect11888ms · $0.0031
full reasoning
Final pick: Kg3 — King must stay centralized and active — retreat is impossible with rooks on d2/e1. Kg3 centralizes toward f3/g3 per Philidor, keeps king mobile to contest a-pawn march, and avoids giving Black a tempo target.. Rejected: g2g3, f2f3.
9. Commit Commit Kg3 (f4g3).
82...Rc1stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: e1c1
- stockfish_uci1005ms
83.Kf4Sonnet
1. Observe Halbzug 83, Weiss am Zug. Phase: Endspiel. Schwarz +14 Punkte. Legale Zuege: 7. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search2ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Vacate g3 immediately — king blocks g2 pawn cold. Move to f4 or f3, then chain f2-f4 and g2-g3-g4 to create connected passed pawns as the only source of counterplay. Three connected passers advancing towa…
- llm.plan63783ms · $0.0474
full reasoning
Phase: endgame. Vacate g3 immediately — king blocks g2 pawn cold. Move to f4 or f3, then chain f2-f4 and g2-g3-g4 to create connected passed pawns as the only source of counterplay. Three connected passers advancing toward f5/g5 maximises practical resistance before Black's a-pawn queens. Push the f/g/h pawn trio as far as possible to manufacture promotion threats that demand precise Black coordination — exploiting the engine-horizon gap: a connected f5-g4-h5 pawn chain reaching the 5th rank within 5 moves sits at the outer edge of a 1320 calculation window. Critical: g2 pawn is completely frozen while king stands on g3 — this is the #1 structural emergency to fix; Black rooks dominate ranks 1-2; h2 is illegal (d2 rook covers entire rank 2), so king must step to f3 or f4, not h-file; Black a6/a7 pawn pair will queen if unopposed — White has no time for slow manoeuvres, must counter immediately with own pawn advances.
6. Candidates Candidates: Kf4 (King-safety heuristic: g2 frozen while king blocks g3 — structural emergency #1. Kf4 clears g-file, activates king for g2-g3-g4 chain.) | Kf3 (Pawn-structure heuristic: vacates g3 blocker; Kf3 lets g2-g3…
- chess.js.legal_moves0ms
- llm.candidates71319ms · $0.0544
full reasoning
Candidates: Kf4 (King-safety heuristic: g2 frozen while king blocks g3 — structural emergency #1. Kf4 clears g-file, activates king for g2-g3-g4 chain.) | Kf3 (Pawn-structure heuristic: vacates g3 blocker; Kf3 lets g2-g3 start next move. Slightly more defensive than Kf4 but follows the f/g/h trio plan.) | f4 (Immediate pawn-structure fix: f2-f4 leap creates passed pawn candidate, begins connected trio. King still blocks g2 but direct counterplay gained.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kf4 — King-safety emergency #1: g2 is frozen while king sits on g3. Kf4 clears the g-file instantly, allowing g2-g3-g4 chain next moves. King on f4 also centralises for pawn-trio support toward f5/g5.. Reject…
- llm.reflect12869ms · $0.0031
full reasoning
Final pick: Kf4 — King-safety emergency #1: g2 is frozen while king sits on g3. Kf4 clears the g-file instantly, allowing g2-g3-g4 chain next moves. King on f4 also centralises for pawn-trio support toward f5/g5.. Rejected: g3f3, f2f4.
9. Commit Commit Kf4 (g3f4).
84...Rxf2+stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: d2f2
- stockfish_uci1006ms
85.Kg3Sonnet
1. Observe Halbzug 85, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 2. Schach! Criticality: 0.45.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search10ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Halbzug 85, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 2. Schach! Criticality: 0.45. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defe…
full reasoning
Phase: endgame. Halbzug 85, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 2. Schach! Criticality: 0.45. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend prophylactically. [LLM-Error: Claude CLI subprocess timed out after 120000ms]
6. Candidates Candidates: Kg3 (Defends g2 pawn directly (defend prophylactically). King stays close to both pawns, limiting rook activity.) | Ke3 (Activates the king toward center (memory: activate the king). Steps away from rook batt…
- chess.js.legal_moves0ms
- llm.candidates23384ms · $0.0150
full reasoning
Candidates: Kg3 (Defends g2 pawn directly (defend prophylactically). King stays close to both pawns, limiting rook activity.) | Ke3 (Activates the king toward center (memory: activate the king). Steps away from rook battery on f-file.)
7. Verify Alle 2 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kg3 — White is in check from Rf2. Kg3 escapes check while keeping the king on g3 to defend the g2 pawn (memory: defend prophylactically). Ke3 abandons g2 to immediate Rxg2 with zero compensation.. Rejected: f…
- llm.reflect46750ms · $0.0351
full reasoning
Final pick: Kg3 — White is in check from Rf2. Kg3 escapes check while keeping the king on g3 to defend the g2 pawn (memory: defend prophylactically). Ke3 abandons g2 to immediate Rxg2 with zero compensation.. Rejected: f4e3.
9. Commit Commit Kg3 (f4g3).
86...Ra2stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: f2a2
- stockfish_uci1004ms
87.h4Sonnet
1. Observe Halbzug 87, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 5. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search10ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Push h-pawn toward h4 as the only active try; hold king in the f3-g3 cluster to stay off the back ranks controlled by Ra2 and Rc1; avoid king wandering into a mating net. Advance both pawns as far as poss…
- llm.plan62983ms · $0.0473
full reasoning
Phase: endgame. Push h-pawn toward h4 as the only active try; hold king in the f3-g3 cluster to stay off the back ranks controlled by Ra2 and Rc1; avoid king wandering into a mating net. Advance both pawns as far as possible to create a queening threat that forces Black to commit at least one rook to blockade duty, reducing the mating-attack firepower in a position that is structurally lost. Critical: Ra2 owns the entire 2nd rank — king can never reach h2 or f2 safely; Rc1 owns rank 1 — king is confined to rank 3 and above; h4 is safe (h5 black pawn attacks only g4, not h4 — Kg4 is the illegal square); h3-h4 pawn push is immediately playable; Engine-horizon heuristic: a slow 4-6 move pawn advance (h4→h5→h6) may fall outside the 1320 engine's accurate compensation window, buying extra resistance; Philidor heuristic (inverted): forcing Black to assign a rook to the h-file blockade removes one attacking piece from the mating net.
6. Candidates Candidates: h4 (Directly executes plan: 'h3-h4 pawn push immediately playable'; triggers engine-horizon heuristic — 4-6 move advance may escape accurate compensation.) | Kf3 (Holds the f3-g3 cluster explicitly named in p…
- chess.js.legal_moves0ms
- llm.candidates50856ms · $0.0422
full reasoning
Candidates: h4 (Directly executes plan: 'h3-h4 pawn push immediately playable'; triggers engine-horizon heuristic — 4-6 move advance may escape accurate compensation.) | Kf3 (Holds the f3-g3 cluster explicitly named in plan; stays off rank 2 (Ra2 owns it) and rank 1 (Rc1 owns it).) | Kf4 (King advances to rank 4, safe from both Ra2 (rank 2) and Rc1 (rank 1); heuristic-suggested, keeps king active.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: h4 — Directly executes the plan's pawn advance; triggers engine-horizon heuristic (4-6 move h4→h5→h6 march may escape 1320-engine accurate compensation); forces Black to commit a rook to h-file blockade, redu…
- llm.reflect9386ms · $0.0031
full reasoning
Final pick: h4 — Directly executes the plan's pawn advance; triggers engine-horizon heuristic (4-6 move h4→h5→h6 march may escape 1320-engine accurate compensation); forces Black to commit a rook to h-file blockade, reducing mating-net firepower per Philidor heuristic.. Rejected: g3f3, g3f4.
9. Commit Commit h4 (h3h4).
88...Kf7stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: g7f7
- stockfish_uci801ms
89.Kh3Sonnet
1. Observe Halbzug 89, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 4. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search3ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Halbzug 89, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 4. Criticality: 0.20. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend proph…
full reasoning
Phase: endgame. Halbzug 89, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 4. Criticality: 0.20. Memory: 5 position hit(s) + 3 opponent hit(s). Plan: activate the king, create passed pawns, defend prophylactically. [LLM-Error: Claude CLI subprocess timed out after 120000ms]
6. Candidates Candidates: Kf4 (King activation toward center and passed pawn creation — king safety first, then advance toward f6 pawn.) | Kf3 (Centralizes king prophylactically, keeps h4 pawn defended while preparing to activate towa…
- chess.js.legal_moves0ms
- llm.candidates10043ms · $0.0035
full reasoning
Candidates: Kf4 (King activation toward center and passed pawn creation — king safety first, then advance toward f6 pawn.) | Kf3 (Centralizes king prophylactically, keeps h4 pawn defended while preparing to activate toward queenside.) | Kh3 (Defends h4 pawn directly, improving worst piece (king) per positional heuristic before counterplay.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kh3 — King safety first: Kh3 defends h4 directly, avoiding the immediate Rc4+ tempo loss that Kf4 allows. Sets up Kg4 activation threatening h5 — aligning with memory heuristics 'defend prophylactically' and …
- llm.reflect108566ms · $0.0847
full reasoning
Final pick: Kh3 — King safety first: Kh3 defends h4 directly, avoiding the immediate Rc4+ tempo loss that Kf4 allows. Sets up Kg4 activation threatening h5 — aligning with memory heuristics 'defend prophylactically' and 'activate the king' via the h3-g4 route.. Rejected: g3f4, g3f3.
9. Commit Commit Kh3 (g3h3).
90...a5stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: a6a5
- stockfish_uci1007ms
91.g4Sonnet
1. Observe Halbzug 91, Weiss am Zug. Phase: Endspiel. Schwarz +15 Punkte. Legale Zuege: 4. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search17ms
3. Recall Opponent 3 pattern(s) found for Stockfish-class engine (tag=chess-engine-style).
- nex_entity_search4ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Activate king toward g3/g4 to support g-pawn advance; push g-pawn as sole queening try to create distraction; avoid back-rank or mid-board mating nets for as long as possible across the next 3-5 moves Whi…
- llm.plan47898ms · $0.0331
full reasoning
Phase: endgame. Activate king toward g3/g4 to support g-pawn advance; push g-pawn as sole queening try to create distraction; avoid back-rank or mid-board mating nets for as long as possible across the next 3-5 moves White's only practical resource is advancing g2 toward g8 while keeping the king in front of or beside the pawn — a forlorn Lucena-style queening attempt that forces Black's two rooks to coordinate precisely rather than mating immediately. Critical: Black rook on a2 controls entire second rank — Kh2 is illegal, king is boxed to g3/g4 corridor; Black rook on c1 threatens back-rank control and eventual mate once king is driven away from g-file; h4 pawn is permanently frozen by h5 — only g2 has any dynamic potential; delaying its advance wastes the only active resource; Engine-defense pattern from memory: expect Black to coordinate rooks optimally — no blunder-based saving hope; Philidor/Lucena theory confirms the defender (White here) must push the pawn rather than passively wait.
6. Candidates Candidates: g4 (Lucena/Philidor heuristic: push the pawn actively rather than wait. Gains space immediately, forcing Black rooks to react now.) | Kg3 (King activates into g3/g4 corridor per plan; king leads pawn is stand…
- chess.js.legal_moves0ms
- llm.candidates48754ms · $0.0377
full reasoning
Candidates: g4 (Lucena/Philidor heuristic: push the pawn actively rather than wait. Gains space immediately, forcing Black rooks to react now.) | Kg3 (King activates into g3/g4 corridor per plan; king leads pawn is standard technique, prepares g4 next with full support.) | g3 (Cautious pawn advance to g3 keeps king cover on h3; avoids exposing king on h2 while still advancing the only queening try.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: g4 — Lucena/Philidor heuristic: push the pawn actively rather than wait. Gains space immediately, forcing Black rooks to react now.. Rejected: h3g3, g2g3. [LLM note: Claude CLI subprocess timed out after 1200…
full reasoning
Final pick: g4 — Lucena/Philidor heuristic: push the pawn actively rather than wait. Gains space immediately, forcing Black rooks to react now.. Rejected: h3g3, g2g3. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit g4 (g2g4).
92...Rc3#stockfish-1320
- 1. Observe— missing —
- 2. Recall Position— missing —
- 3. Recall Opponent— missing —
- 4. Research— missing —
- 5. Plan— missing —
- 6. Candidates— missing —
- 7. Verify— missing —
- 8. Reflect— missing —
9. Commit Engine stockfish-1320 (stockfish UCI_Elo 1320) pick: c1c3
- stockfish_uci80ms
PGN
PGN anzeigen
[Event "Calibration chess-sonnet-tm vs stockfish-1320"] [Site "?"] [Date "2026-05-29"] [Round "?"] [White "chess-sonnet-tm"] [Black "stockfish-1320"] [Result "*"] 1. e4 e5 2. Nf3 d5 3. exd5 Nf6 4. Nc3 c6 5. Bc4 cxd5 6. O-O dxc4 7. b3 Bd6 8. bxc4 O-O 9. d3 Nc6 10. Be3 Bb4 11. Nd5 Bd6 12. Rc1 Bg4 13. h3 Bf5 14. Nxf6+ gxf6 15. Nxe5 Bxe5 16. d4 Bb8 17. d5 Bg6 18. Re1 Ne7 19. d6 Bxd6 20. Bd4 Nf5 21. Bxf6 Qxf6 22. Qxd6 Qxd6 23. c5 Qxc5 24. Re4 Nd4 25. Rxd4 Rac8 26. Rd8 Rcxd8 27. Re1 Bxc2 28. Kf1 Qb5+ 29. Kg1 Qb1 30. Rxb1 Bxb1 31. a4 Rfe8 32. a5 Rd2 33. a6 Re1+ 34. Kh2 bxa6 35. Kg3 Bf5 36. Kh2 h6 37. Kg3 Kg7 38. Kf4 Bh7 39. Kg3 f6 40. Kf4 h5 41. Kg3 Rc1 42. Kf4 Rxf2+ 43. Kg3 Ra2 44. h4 Kf7 45. Kh3 a5 46. g4 Rc3# *