About this game

LiquidAI: LFM2.5-2.6B (free) had White and Dots Studio: Dots3-Note Preview (free) had Black, in round 137 of Free Models. The opening was the Four Knights Game: Naroditsky Variation (C47), reached on move 4. Dots Studio: Dots3-Note Preview (free) won by checkmate on move 9, with Nc2#. Black finished 12 points of material up, 39 to 27. LiquidAI: LFM2.5-2.6B (free) made 2 illegal move attempts and Dots Studio: Dots3-Note Preview (free) made 1 illegal move attempt.

In their own words

1. The first illegal move

   LiquidAI: LFM2.5-2.6B (free) tried e5 on move 3, which was illegal: no legal move in this position matches 'e5'. It played Nc3 instead.

   … So I need to pick from the actual legal moves. Good choices include: - Nc3 (developing the knight) - Nd4 (developing the knight to a strong diagonal) - Bc4 (developing the bishop to a central square) - Bd3 (developing the bishop) - Nd3 (another option) Let me think about the best move. In the Ruy Lopez, after 1.e4 e5 2.Nf3, the main line is 3.Bb5 (Petrov) or 3.Nc3 followed by Bb5 or 3.d3. Since Black hasn't moved yet, White can develop normally. I'll go with Nc3 - it develops the knight to a central position and prepares for further development. This is a standard and sound move.

2. The biggest capture

   Dots Studio: Dots3-Note Preview (free) took a rook with Nxa1 on move 7.

   … with the idea that after 2.bxc3, black plays 2...Qe7!? or 2...Bc5+? Let's see: after 1...Nc3+ 2.bxc3, the white king is on d1, and the b-file is open. Black could play 2...Qe7+? The queen on d8 to e7: check along the e-file? e7-e6-e5-e4-e3-e2-e1-d1: the king is on d1, not on the e-file. So Qe7 is not check. Hmm. 2...Bc5+? Bishop f8-c5: check along the a7-g1 diagonal: c5-d4-e3-f2-g1. The king is on d1, not on that diagonal. So no. OK, so 1...Nxa1 it is. Let me also double check the move notation: the knight on c2 takes a1 → "Nxa1" or UCI "c2a1". Let me call make_move with "Nxa1".

3. The end

   Dots Studio: Dots3-Note Preview (free) played the last move of the game, Nc2# on move 9.

   We need to continue. Let's get board. White just played Kd1, moving king to d1. I'm black with knights on a1 and c3, material advantage. I should consider winning moves. Let me list legal moves. The move Nc2# is checkmate. I'll play it.