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The65thSquare Puzzle 0110
This problem was composed by Max Euwe, who was World Champion from 1935 to 1937.

White to play and mate in two.

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The Solution

White prevents the defense ...d6 in the most dramatic way possible, by offering a queen sacrifice!
Although there is no threat, every Black move creates a weakness which allows mate.

After 1...c6 (or c5) White can play 2 Qb8 mate, while if the rook moves then d7 is not guarded, so White can play 2 Qxd7 mate. Finally, if Black accepts the sacrifice by 1...cxd6, then 2 Rc1 is mate.


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