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4手 · 古典的な密度

Tap a white piece, then tap a highlighted square to play the mating move.

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About PlayMemorize Chess Mate

PlayMemorize Chess Mate is a free mate-in-one trainer. Every round shows a board position and three to eight candidate moves · exactly one delivers checkmate. Pick it and your streak grows; pick wrong and the run ends.

Cheat-proof validation. The puzzle is validated by a pure evaluateMateInOne function that plays your move, then enumerates every legal reply for the opposing king. If the king has zero legal escapes and is in check, it's mate. No server, no database · just deterministic rules.

Difficulty scales in two directions. Raise difficulty (1-10) to broaden the pattern catalogue · back-rank, smothered, two-piece fork mates. Raise level (via the Labyrinth) to grow the choice list up to eight plausible decoys drawn from the board's legal moves.

Part of the PlayMemorize family of free brain-training games. Runs entirely in your browser, works offline as a Progressive Web App.

よくある質問

Q: What is Chess Mate?

A free mate-in-one puzzle game. Each round shows a board position and a handful of candidate moves · exactly one delivers checkmate. Pick it to build a streak, miss once and the run ends.

Q: How is the correct answer validated?

A pure function called evaluateMateInOne plays your chosen move on a copy of the board, then enumerates every legal reply for the opposing king. If the king has zero legal escapes and is in check, the move is mate. The validator is the sole oracle · there is no preset "correct" flag to cheat against.

Q: How do I read the moves?

Moves are shown in UCI notation (e.g. e2e4, h1h8). The first two characters are the source square, the last two are the destination. The board is drawn above the choice list with standard Unicode chess pieces.

Q: Does difficulty change the puzzles?

Yes. Higher difficulty widens the set of mate patterns (back-rank, smothered mate, long-range pinning checks) and the labyrinth level ramp grows the choice count from three up to eight plausible decoys drawn from the legal moves in the position.

Q: Is it free?

Yes, completely free. No account, no ads, no paywalls. Your high streak is stored locally in your browser.