Black and White

de boer chess problem

By Gerke Luiten De Boer. White to mate in two moves.

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White wins with the most unlikely move on the board, 1. Nd4!, threatening to jump to b5 or f5 with mate. Black can stop this only by capturing the knight with a pawn, which permits White to push a pawn of his own, giving mate. From Sissa, 1872.