Wait, white played g4! They pushed their g2 pawn to g4. And there's an en passant target on g3. Let me check the FEN: "5r2/pp3r1k/7p/2p5/6P1/8/q7/7K b - - 0 28" en_passant: "g3" - so en passant is available on g3. The board shows rank 4: ". . . . . . P . 4" - white pawn on g4 (position 7 from left = g4). So white played g2-g4. And the en passant square is g3. Now material is -22 (I'm up 22!). White has only king + pawn now. Looking at the board: - White: K h1, pawn g4 (just moved from g2) - Black: K h7, Q a2, R f8, R f7, pawns a7, b7, c5, h6 Wait, where's my c-pawn? The FEN shows c5. And what about the rook? F7 has rook, f8 has rook. Looking at the legal moves, I notice Rf1#! That's checkmate! Let me verify: Rf1 from f7 to f1. - Rook on f1 attacks king on h1 (same rank). Check! - King on h1: - Move: g1 (attacked by rook), g2 (empty, attacked by rook? f1 to g2 not on line. But wait, g2 is on diagonal from h1. Let me check what attacks g2. My queen on a2 attacks g2? a2 to g2 same rank, with b2, c2, d2, e2, f2 between. Wait, are those empty? Let me check. b2 captured (pawn gone). c2 empty. d2-e2 empty. f2 empty. So queen on a2 attacks g2! Yes! So g2 attacked. - h2 (empty, attacked by queen on a2? a2 to h2 same rank, no pieces between. Yes attacked!) - h1 attacked by rook on f1. - So all king moves attacked. And rook can't be captured (no white piece attacks f1). - Mate! Wait, but I need to verify the rook path. Rf1: rook on f7 to f1. f-file: f6, f5, f4, f3, f2, f1. All empty? Let me check. - f6 empty - f5 empty - f4 empty - f3 empty - f2 empty - f1 empty Yes, all empty. So Rf1 is legal. And it's checkmate! Let me play Rf1#!
About this game
MiniMax: MiniMax M2.7 (free) had White and MiniMax: MiniMax M3 (free) had Black, in round 121 of Free Models. The opening was the Italian Game: Giuoco Pianissimo (C50), reached on move 5. MiniMax: MiniMax M3 (free) won by checkmate on move 28, with Rf1#. Black finished 22 points of material up, 23 to 1. MiniMax: MiniMax M3 (free) made 5 illegal move attempts; its opponent made none.
In their own words
The first illegal move
MiniMax: MiniMax M3 (free) tried c6d4 on move 7, which was illegal: the knight on c6 cannot move to d4. It played dxc3 instead.
… But wait, can a pawn move from d4 to c3? d4 to c3 is a diagonal pawn capture, so yes. But what's the legal notation? "dxc3" - the d-pawn captures on c3. Yes! That's a legal move. After dxc3 bxc3 (or whatever), I gain a piece for a pawn. But wait, the d4 pawn is attacked by Re1 and Bc4. If I move my d4 pawn to capture c3, then I also relieve the attack on d4. And I win a piece. Actually, the standard move in this position is dxc3, sacrificing a pawn for a piece. This is the Møller Attack / Italian center continuation. Let me play dxc3.
its reply, the end of it — the whole turn is in the replay above The biggest capture
MiniMax: MiniMax M3 (free) took a queen with Rxf7 on move 18.
… No, can't castle anymore. - Other pieces in place Both are winning. Let me go with Rxf7 - it keeps the king safe. Actually, on second thought, Kxf7 might have a tactical benefit. The king on f7 could deliver check or mate threats. Wait, king on f7 - what does it attack? f7 king attacks e6, e7, e8, f6, f8, g6, g7, g8. Most are empty or own pieces. King on f7 might attack the f6 square (where I could put a piece). Hmm, both moves are fine. Let me just go with Rxf7 - safer choice.
its reply, the end of it — the whole turn is in the replay above The end
MiniMax: MiniMax M3 (free) played the last move of the game, Rf1# on move 28.
… Let me check. b2 captured (pawn gone). c2 empty. d2-e2 empty. f2 empty. So queen on a2 attacks g2! Yes! So g2 attacked. - h2 (empty, attacked by queen on a2? a2 to h2 same rank, no pieces between. Yes attacked!) - h1 attacked by rook on f1. - So all king moves attacked. And rook can't be captured (no white piece attacks f1). - Mate! Wait, but I need to verify the rook path. Rf1: rook on f7 to f1. f-file: f6, f5, f4, f3, f2, f1. All empty? Let me check. - f6 empty - f5 empty - f4 empty - f3 empty - f2 empty - f1 empty Yes, all empty. So Rf1 is legal. And it's checkmate! Let me play Rf1#!
its reply, the end of it — the whole turn is in the replay above