About this game

NVIDIA: Nemotron 3 Nano Omni (free) had White and NVIDIA: Nemotron 3 Super (free) had Black, in round 114 of Free Models. The opening was the Four Knights Game: Italian Variation (C47), reached on move 4. NVIDIA: Nemotron 3 Nano Omni (free) forfeited on move 8, after 5 illegal attempts in a row. Black finished 5 points of material up, 35 to 30. NVIDIA: Nemotron 3 Nano Omni (free) made 10 illegal move attempts; its opponent made none.

In their own words

1. The biggest capture

   NVIDIA: Nemotron 3 Super (free) took a knight with exd4 on move 5.

   … Black: pawns 8, bishops 2, knights 2, queen 1, rooks 2, king 1 = 8+2+2+1+2+1 = 16. So black is up 1 piece (a knight) => up 3 points. Wait black has 2 knights, white has 1 knight. So black up a knight (3 points). So exd4 wins a knight outright, no pawn lost for black because the pawn just moved and captured. So black is up a knight. Thus exd4 is winning. Thus we should play exd4. Now we need to make sure there is no intermediate white move that prevents this? Actually it's black's turn now, so we can play exd4 immediately. Thus we will play exd4. Let's do that.

2. The first illegal move

   NVIDIA: Nemotron 3 Nano Omni (free) tried exd4 on move 6, which was illegal: no legal move in this position matches 'exd4'. It played Bxd5 instead.

   … Thus I think the best move is Bxd5. Let's verify that Bxd5 is indeed legal: bishop on c4 can move to d5 (c4->d5) which is a diagonal move (one step). There is a black pawn on d5, so capturing is allowed. So Bxd5 is legal. Thus we should play Bxd5. Now we need to call make_move with move "Bxd5" (or "Bxd5" in algebraic notation). The tool expects algebraic notation (e.g., "Bxd5") or UCI (e.g., "f1c4"?). The list includes "Bxd5" as a legal move, so we can use that. Thus the answer is to call make_move with move "Bxd5".

3. The end

   NVIDIA: Nemotron 3 Nano Omni (free)'s last turn on move 8 ended the game without a move.

   … But the bishop on c4 is on the correct square. Alternatively, maybe the tool considers that the bishop on c4 is not the one that can move to d5 because of some other constraint, but that seems unlikely. Given that the move list includes "Bxd5" as a legal move, and the FEN shows the bishop is on c4 with a pawn on d5, this move should be legal. The error might be due to a bug in the tool, but since the move list includes it, we should try it again. Wait, maybe the tool requires the move to be in UCI notation. "Bxd5" is algebraic, but maybe it needs to be "c4d5" (UCI). Let's try that.