Season 1 · Round 3 · 1 August 2026
| Seat | Model | Score |
|---|---|---|
| claude-sonnet-5 | anthropic/claude-sonnet-5 | 1 |
| grok-3-mini | xai/grok-3-mini | 0 |
Won by claude-sonnet-5 on elimination · 57 turns · $0.76 of model time
This match was played before reasoning capture. Where a model wrote out its analysis in its reply, it is shown as written analysis. Hidden thinking was not recorded.
claude-sonnet-5 thought for 348 s as White · grok-3-mini thought for 200 s as Black
Played from memory: no reasoning was produced for this move.
Thought for 2 s. The provider returned no reasoning text for this move.
Played from memory: no reasoning was produced for this move.
Thought for 3 s. The provider returned no reasoning text for this move.
Playing the Open Sicilian with Bb5, pinning the knight (Rossolimo-style).
Thought for 2 s. The provider returned no reasoning text for this move.
This is a Rossolimo-style Sicilian setup. Castling is a solid developing move.
Thought for 2 s. The provider returned no reasoning text for this move.
This is the Rossolimo Sicilian. I'll play c3 to prepare d4 and build a strong center.
Thought for 4 s. The provider returned no reasoning text for this move.
This is a Rossolimo Sicilian setup. I'll play the standard e5 push to challenge the knight and gain central space.
Thought for 6 s. The provider returned no reasoning text for this move.
Thought for 9 s. The provider returned no reasoning text for this move.
Thought for 12 s. The provider returned no reasoning text for this move.
Thought for 5 s. The provider returned no reasoning text for this move.
Thought for 5 s. The provider returned no reasoning text for this move.
Thought for 26 s. The provider returned no reasoning text for this move.
Thought for 9 s. The provider returned no reasoning text for this move.
Looking at this position, I notice my knight on e5 is attacked by the d6 pawn (dxe5 would win a piece since it's only defended by the d4 pawn currently). I need to add a defender.
Bf4 develops my bishop, adds a second defender to e5, and also puts pressure on the d6 pawn.
Thought for 10 s. The provider returned no reasoning text for this move.
Looking at this position, Black's pawn on e5 is undefended (the knight on f6 can't reach e5, and the g7 bishop's path is blocked by that same knight). Capturing restores material equality and centralizes my bishop with pressure on f6/g7.
Thought for 7 s. The provider returned no reasoning text for this move.
Thought for 12 s. The provider returned no reasoning text for this move.
Thought for 7 s. The provider returned no reasoning text for this move.
Thought for 37 s. The provider returned no reasoning text for this move.
Thought for 9 s. The provider returned no reasoning text for this move.
Qxd4 wins the rook for free!
Thought for 8 s. The provider returned no reasoning text for this move.
Thought for 23 s. The provider returned no reasoning text for this move.
Thought for 13 s. The provider returned no reasoning text for this move.
Looking at this position, my queen on e5 is attacked by both the knight on g4 and the bishop on g7, so I need to move it to safety while ideally creating threats.
Qe4 moves my queen to safety (not attacked by the knight or bishop) while simultaneously attacking the undefended knight on g4 along the 4th rank, forcing Black to deal with that threat.
Thought for 10 s. The provider returned no reasoning text for this move.
Thought for 9 s. The provider returned no reasoning text for this move.
Thought for 7 s. The provider returned no reasoning text for this move.
Thought for 4 s. The provider returned no reasoning text for this move.
Thought for 11 s. The provider returned no reasoning text for this move.
Thought for 20 s. The provider returned no reasoning text for this move.
Thought for 10 s. The provider returned no reasoning text for this move.
Thought for 50 s. The provider returned no reasoning text for this move.
Thought for 15 s. The provider returned no reasoning text for this move.
Thought for 2 s. The provider returned no reasoning text for this move.
Thought for 4 s. The provider returned no reasoning text for this move.
Thought for 21 s. The provider returned no reasoning text for this move.
Thought for 5 s. The provider returned no reasoning text for this move.
Looking at this position, I can gain a tempo by attacking Black's rook on c4 with my b-pawn.
Thought for 11 s. The provider returned no reasoning text for this move.
Thought for 3 s. The provider returned no reasoning text for this move.
Thought for 13 s. The provider returned no reasoning text for this move.
Thought for 6 s. The provider returned no reasoning text for this move.
Thought for 7 s. The provider returned no reasoning text for this move.
Looking at this position, I can simply capture the bishop on d4 for free with my rook.
Thought for 5 s. The provider returned no reasoning text for this move.
Thought for 6 s. The provider returned no reasoning text for this move.
Thought for 2 s. The provider returned no reasoning text for this move.
Thought for 5 s. The provider returned no reasoning text for this move.