About this game

NVIDIA: Nemotron 3 Super (free) had White and LiquidAI: LFM2.5-2.6B (free) had Black, in round 106 of Free Models. The opening was the Petrov's Defense: Three Knights Game (C42), reached on move 3. NVIDIA: Nemotron 3 Super (free) won by checkmate on move 21, with Qe8#. White finished 31 points of material up, 35 to 4. LiquidAI: LFM2.5-2.6B (free) made 10 illegal move attempts; its opponent made none.

In their own words

1. The first illegal move

   LiquidAI: LFM2.5-2.6B (free) tried Nd7 on move 6, which was illegal: no legal move in this position matches 'Nd7'. It played Nc6 instead.

   … g8 (opposition) - a5: Pawn push - b5: Pawn push - c6: Already mentioned - d5: Central pawn push - d6: Central pawn push - e4: Push the e-pawn - f5: Push the f-pawn - f6: Push the f-pawn - g5: Push the g-pawn - g6: Push the g-pawn - h5: Push the h-pawn - h6: Push the h-pawn Given the position, I think Nc6 is a good move - it develops the knight and controls the center. Or Qe7 to attack the queen. Let me go with Nc6. Actually, wait. I should check if Nc6 is indeed a legal move. From the legal moves list, yes, "Nc6" is there. And it's a valid knight move from e6 to c6. Let me make the move Nc6.

2. The biggest capture

   NVIDIA: Nemotron 3 Super (free) took a queen with Nxe7+ on move 14.

   … Pawn g7 attacks f6 and h6. Pawn h7 attacks g6. Pawn c7 attacks b6 and d6. Pawn b7 attacks a6 and c6. Pawn a7 attacks b6. So none attack e7. So Nxe7 is safe. Thus we should play Nxe7. But we must also consider if there is any tactical trick like black playing something like ...Qxe5? Actually after Nxe7, black could play ...Qxe5? Wait black queen is gone. So no. What about ...Bxe5? Black bishop d7 to e5? Bishop d7 to e5: file d to e +1, rank 7 to 5 -2, not equal, so not a bishop move. So no. Thus Nxe7 wins queen. Let's make the move. We'll call make_move with Nxe7.

3. The end

   NVIDIA: Nemotron 3 Super (free) played the last move of the game, Qe8# on move 21.

   … But we captured queen earlier? Actually we captured queen on g6? Wait we played Qxg6, capturing whatever was on g6. That might have been black queen? Let's see: before Qxg6, black queen was on g6? Actually we saw black queen on g6 after black played ...? Actually we saw black queen on g6 after black played ...? Let's check move history: we saw black queen on g6? Actually earlier we saw black queen on g6? Not sure. But we can simply play Qe8# and if it's checkmate, we win. The legal moves list includes "Qe8#" with checkmate true. So we can play that. Thus we should play Qe8#. Let's do that.