Fool's mate
Also known as Two-move checkmate
Fool's mate is the fastest checkmate in chess, finished in just two moves. White self-destructs by pushing the f- and g-pawns, tearing open the diagonal in front of the king. Black's queen lands on h4 with check, and there is no escape, block or capture available - instant mate.
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How it works
White's pawn moves (f3 and g4) strip away every defender of the e1-h4 diagonal. The black queen on h4 gives check straight down that diagonal to the e1 king. The king has no flight square: e2 and d1 are blocked by White's own men, f1 is occupied by the bishop, and f2 is covered by the queen. Nothing can interpose on the open diagonal, and no White piece attacks h4 to capture the queen. With check, no escape, no block and no capture, it is checkmate.
How to spot it
It only happens when one player makes two truly terrible opening moves, so you will almost never see it in real play. Its real value is as a warning: whenever the pawn shield in front of the king is pushed forward early - especially the f- and g-pawns - the diagonal to the king flies open. Watch for an enemy queen or bishop eyeing that diagonal, and avoid weakening your own king's cover for no reason.
Key ideas
- The quickest possible checkmate - just two moves
- Pushing the f- and g-pawns wrecks the king's diagonal cover
- The queen mates along the open e1-h4 (or e8-h5) diagonal
- Only White can be Fool's-mated this fast, because Black moves second
- A cautionary tale: don't weaken the pawns in front of your king
Famous example
A textbook teaching position rather than a tournament game - it requires such poor play that it essentially never occurs between competent players, but it is the classic first lesson in king safety.