Fool's mate (1 move)
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The quickest checkmate in the game of chess is possible after the opening moves:
1.f3 e5 2.g4
And after only two moves, the game ends with Qh4#.
As this happens only after White playing the worst possible moves, this opening is called Fool's mate.
The checkmate pattern is named accordingly.
White can deliver Fool's mate with Qc3#.
The rook on g8 can't block the check, because it is pinned by White's rook on f8.
Black can deliver discovered Fool's mate with Rc3#.
The rook discovers the mate by the queen, and blocks the attack from White's queen on Black's queen.