Black moved the king to e8. Now **Rb8#** is mate — the king can't escape to d7, e7, or f7 (all covered by my queen), d8 and f8 are covered by the rook, and the rook on b8 is defended by the queen so the king can't capture it. Let me verify and deliver checkmate.
**Qc8#** is checkmate — confirmed by the legal moves list. The king on e8 is checked by the queen on c8, with every escape square covered (d7, e7, f7 by the queen; d8 and f8 by the rook on b8), and the queen is defended by the rook on b1, so it can't be captured. Game over — I win. Let me deliver the final blow.
About this game
Dots Studio: Dots3-Note Preview (free) had White and Cohere: North Mini Code (free) had Black, in round 127 of Free Models. The opening was the Sicilian Defense: Open (B32), reached on move 3. Dots Studio: Dots3-Note Preview (free) won by checkmate on move 23, with Qc8#. White finished 17 points of material up, 31 to 14. Dots Studio: Dots3-Note Preview (free) made 4 illegal move attempts and Cohere: North Mini Code (free) made 10 illegal move attempts.
In their own words
The first illegal move
Cohere: North Mini Code (free) tried Na6 on move 4, which was illegal: no legal move in this position matches 'Na6'. It played d5 instead.
… The key observation is that the knight's location and potential moves don't seem to match the original position's piece placements, indicating a potential recording or interpretation error in the game's move history. I see the knight has moved from its original position to the d4 square, capturing a piece. This allows other knights to potentially capture that piece. The board shows the knight now sits on d4, with potential captures available for both light and dark square knights. I'll need to carefully track the piece movements and capture possibilities in this chess scenario.
its reasoning, the end of it — the whole turn is in the replay above The biggest capture
Dots Studio: Dots3-Note Preview (free) took a queen with Kxh2 on move 10.
… wait balance 1 means white is up 1 point). Hmm, earlier balance was 2 (up a piece for a pawn = +2). Now balance 1. So Black captured something — the pawn on f2, the queen went to f2 capturing. So material now: white 37, black 36, white up 1 (a minor piece for two pawns). So I'm up a piece for two pawns. The queen check must be dealt with. Only Kg1. After Kg1, the queen on f2 is attacked by the king. Black must move it or lose it for nothing. If Black moves it away, I remain up a piece for two pawns. Good. Let me play Kg1. Only Kxh2 is legal.
its reasoning, the end of it — the whole turn is in the replay above The end
Dots Studio: Dots3-Note Preview (free) played the last move of the game, Qc8# on move 23.
… and **Rb8#** is mate: the king on e8 has no escape (d7/f7 covered by the queen, f8/d8 covered by the rook, e7 covered by the queen, and the rook on b8 is defended by the queen so the king can't capture it). The bishop on f8 blocks nothing relevant. Let me verify with legal moves and play Rb8#. **Qc8#** is checkmate — the legal moves list confirms it with the "checkmate": true flag. The king on e8 is checked by the queen on c8, and can't escape: d7, e7, f7 covered by the queen, d8/f8 covered by the rook on b8, and the queen is defended by the rook on b1 so Kxc8 fails. Let me deliver checkmate.
its reasoning, the end of it — the whole turn is in the replay above