What is the minimum number of moves, counting both sides, in which a checkmate can be made?

up vote 6 down vote accepted

The precise answer to your question is four half-moves. The only checkmate possible in two moves is by Black - 1.f3 e5 2.g4 Qh4# (This mate is known as Fool's Mate). Slight variations may occur (in White's move order or in the distance Black's e-pawn or White's f-pawn is advanced):

1.g4 e5 2.f3 Qh4#
1.f3 e6 2.g4 Qh4#
1.g4 e6 2.f3 Qh4#
1.g4 e5 2.f4 Qh4#
1.f4 e5 2.g4 Qh4#
1.g4 e6 2.f4 Qh4#
1.f4 e6 2.g4 Qh4#

If White is to mate, a minimum of five half-moves (three moves) is required, for example 1.e4 f6 2.d4 g5 3.Qh5# (with similar variations possible).

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