About this game

LiquidAI: LFM2.5-2.6B (free) had White and NVIDIA: Nemotron 3 Ultra (free) had Black, in round 31 of Free Models. The opening was the Scotch Game (C44), reached on move 3. NVIDIA: Nemotron 3 Ultra (free) won by checkmate on move 60, with Qa1#. Black finished 12 points of material up, 13 to 1. LiquidAI: LFM2.5-2.6B (free) made 20 illegal move attempts and NVIDIA: Nemotron 3 Ultra (free) made 6 illegal move attempts.

In their own words

1. The first illegal move

   LiquidAI: LFM2.5-2.6B (free) tried Qe7 on move 5, which was illegal: no legal move in this position matches 'Qe7'. It played Nd2 instead.

   … Let me pick one. Good options include: - Nd2 (developing a knight) - Qe2 (queen to e2) - Qf3 (queen to f3) - Qh5 (queen to h5) - Rg1 (rook to g1) - Bc4 (bishop to c4) - Bg5 (bishop to g5) - Nc3 (knight to c3) I'll go with Nd2 - developing a knight to a central square. This is a standard opening move after e4 and Nf3. Actually, wait - I should check if any of the previously played moves were already used. The move history shows: 1. e4 2. Nf3 3. d4 4. Nxe5 5. Qe7 (failed attempt) So the legal moves are fresh. Let me proceed with Nd2.

2. The biggest capture

   NVIDIA: Nemotron 3 Ultra (free) took a queen with Bxe3+ on move 15.

   … Or block with a piece on d2? But there's no piece on d2. Let me check material: black has 32, white has 31. Black is up a pawn (balance -1 means black is up 1). If I play Bxe3+, I win the queen for a bishop. That's a great trade! Queen (9) for bishop (3) = +6 material. But white gets to move king. Still, winning the queen is huge. Let me verify: white queen on e3, black bishop on g5. Bxe3+ captures queen. White king on c1. After Kxe3? No, king on c1 can't capture on e3 (too far). King moves to b1, d1, or d2. Then black has won the queen. This seems like a clear win. Let me play Bxe3+.

3. The end

   NVIDIA: Nemotron 3 Ultra (free) played the last move of the game, Qa1# on move 60.

   … No, queen can't capture king. Qc1+ would move queen to c1 where white king is - that's illegal. So Qc1+ is not a capture, it's moving to c1 which is occupied by white king - illegal. Qb1+: queen from a2 to b1, checking white king on c1. That's check. Qa1+: queen from a2 to a1, checking on file. Qb2+: queen from a2 to b2, checking diagonally. Qc2+: queen from a2 to c2, checking on rank. All good. But also black king on c3 is close. I should be careful not to stalemate. Simplest: Qa1+ forces white king to move. Then I can bring my king up and mate. Let me play Qa1+.