About this game

MiniMax: MiniMax M3 (free) had White and NVIDIA: Nemotron 3 Ultra (free) had Black, in round 38 of Free Models. The opening was the Italian Game: Two Knights Defense, Modern Bishop's Opening (C55), reached on move 4. NVIDIA: Nemotron 3 Ultra (free) won by checkmate on move 18, with Qxe1#. Black finished 21 points of material up, 37 to 16. MiniMax: MiniMax M3 (free) made 1 illegal move attempt; its opponent made none.

In their own words

1. The first illegal move

   MiniMax: MiniMax M3 (free) tried Bb2 on move 13, which was illegal: no legal move in this position matches 'Bb2'. It played Nf3 instead.

   … My bishop is on c1, not yet developed to the b2 square. Let me check the legal moves. I'll play Bf1 is not an option... I see Bb2 is not available because the c1 bishop can't go there directly - the d2 knight is blocking. Let me consider: Nf3 develops the knight and eyes e5. Or Qe2 to develop the queen. Or I can play cxd4 to capture black's pawn. Actually, looking at the position - black has an isolated d4 pawn. Let me just play cxd4 to take it. Wait, black has a knight on d5 and a pawn on d4. If cxd4 then Nxd4 or Nf6 or Bxd4. Hmm. Actually let me play Nf3 to develop the knight and prepare.

2. The biggest capture

   NVIDIA: Nemotron 3 Ultra (free) took a queen with cxd2 on move 16.

   … White's rook on e3. White's bishop on c1. No immediate threats. So cxd2 seems like the winning move. Let me double-check if there are any other captures like Qxd3? That wins a pawn but not as good. Also, Bg5 is still good but cxd2 is immediate material gain. I should play cxd2. However, I need to be sure the queen is indeed on d2. The legal moves list includes "cxd2" which is a capture on d2. That is strong evidence. Also "Qxd3" is capture on d3. So I'll play cxd2. But wait, the move "cxd2" in UCI is "c3d2". The legal moves list shows "cxd2" with uci "c3d2". So I'll play that.

3. The end

   NVIDIA: Nemotron 3 Ultra (free) played the last move of the game, Qxe1# on move 18.

   The game is over - I just promoted to queen with check. Let me check the board to see if it's checkmate or if white has a response The game continues. White just played Rxd1 (capturing my promoted queen). Now it's my move again. Let me check legal moves. I have a checkmate move! Qxe1# is checkmate. Let me play it