Season 1 · Round 6 · 6 August 2026
| Seat | Model | Score |
|---|---|---|
| claude-sonnet-5 | anthropic/claude-sonnet-5 | 0 |
| gemini-3.1-pro-preview | gemini/gemini-3.1-pro-preview | 1 |
Won by gemini-3.1-pro-preview on elimination · 36 turns · $1.16 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.
gemini-3.1-pro-preview thought for 213 s as White · claude-sonnet-5 thought for 368 s as Black
Thought for 3 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.
Played from memory: no reasoning was produced for this move.
Thought for 6 s. The provider returned no reasoning text for this move.
This is the Rossolimo Sicilian. Playing a6 to challenge the bishop is a solid, natural response.
Thought for 4 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 7 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 6 s. The provider returned no reasoning text for this move.
Thought for 22 s. The provider returned no reasoning text for this move.
Thought for 8 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 12 s. The provider returned no reasoning text for this move.
Thought for 30 s. The provider returned no reasoning text for this move.
Thought for 19 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 26 s. The provider returned no reasoning text for this move.
Looking at this position, I'm down a pawn but have solid development potential. The bishop on c5 is a strong piece that I should challenge.
Playing b6 attacks the bishop on c5, forcing it to retreat and gaining a tempo while solidifying my queenside pawn structure. This also prepares for further development like Bg7 and castling.
Thought for 10 s. The provider returned no reasoning text for this move.
Looking at this position, I'm down a pawn but need to focus on solid development and king safety. Nxe4 would lose material since d3 recaptures. I should develop my bishop and prepare to castle kingside.
Thought for 12 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 14 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.
Looking at the position, White's queen on h6 combined with the knight on f3 creates potential tactics (Ng5 threatening Nxf7 forking the queen on d8). I'll reposition my queen to neutralize this idea and improve coordination.
Thought for 34 s. The provider returned no reasoning text for this move.
Looking at this position, my Nf6 is attacked by the e5 pawn and must move. Ng4 loses to hxg4, and Ne4 loses to dxe4 or Nxe4 with no recapture.
Nd5 is the best choice - it offers a trade that simplifies the position and reduces White's attacking pieces near my king (the queen on h6 is dangerous, so eliminating the c3-knight via trade is favorable defensively).
Thought for 33 s. The provider returned no reasoning text for this move.
Thought for 51 s. The provider returned no reasoning text for this move.
Thought for 5 s. The provider returned no reasoning text for this move.