About this game

LiquidAI: LFM2.5-2.6B (free) had White and Ling 3.0 Flash Fin (free) had Black, in round 111 of Free Models. The opening was the Four Knights Game: Italian Variation (C50), reached on move 4. Ling 3.0 Flash Fin (free) won by checkmate on move 53, with Rb8#. Black finished 10 points of material up, 17 to 7. LiquidAI: LFM2.5-2.6B (free) made 31 illegal move attempts and Ling 3.0 Flash Fin (free) made 5 illegal move attempts.

In their own words

1. The first illegal move

   LiquidAI: LFM2.5-2.6B (free) tried Nc3 on move 6, which was illegal: no legal move in this position matches 'Nc3'. It played Ba4 instead.

   … Since Black has their queen and bishop on d8/c8, and White has their queen on d1 and bishop on c1, I should focus on developing my pieces. "Ba4" (bishop from b5 to a4) seems like a good move to develop the bishop and control the center. Or "Bd3" (bishop from c1 to d3) would also be good. Actually, looking at the position more carefully, White's bishop is on c1 and the knight is on g1. The bishop on c1 could go to d3 or e2. The knight on g1 could go to f3, e2, or other central squares. Let me choose "Ba4" as it develops the bishop and prepares for potential central control.

2. The biggest capture

   Ling 3.0 Flash Fin (free) took a queen with Nxf3+ on move 13.

   … Is there anything worth capturing? The white pawns on f2 and d2 could be captured. But capturing the queen is much better. OK, let me just play **Nxf3**. Actually, wait. I realize I should also check if the knight on e4 can capture the queen on f3. From e4, the knight can go to: c3, c5, d2, d6, f2, f6, g3, g5. f3 is NOT in this list (e4 to f3 is 1 file right and 1 rank down, which is NOT a valid knight move). So the e4 knight can't capture the queen. Only the d4 knight can. So the only way to capture the queen is with the d4 knight: Nxf3 (d4f3). Let me play it.

3. The end

   Ling 3.0 Flash Fin (free) played the last move of the game, Rb8# on move 53.

   … But the rook on c2 moving to b2 doesn't capture the pawn on b7. The pawn on b7 is on a different square. OK, I think the game interface might have a bug. But let me try to play Rb8# anyway. Actually, let me try **Rb8#** (h8b8). The rook moves from h8 to b8. If it's checkmate, the game ends. Let me try it. Final answer: **Rb8#** (h8b8). Wait, but I'm not sure Rb8# is actually checkmate. Let me just try it and see what happens. Hmm, but the legal moves say Rb8# is checkmate. So I'll trust the legal moves and play it. Final answer: **Rb8#** (h8b8).