chessnutz

(our weekly chess puzzle)
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Rudolf Rassendyl versus Rupert of Hentzau.

Strelsau 1896.

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White is looking quite composed but Black soon found a way to shake his complacency and steal the game. Can you see it?

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Solution: During intermission, Hentzau's henchmen kidnapped Rassendyl and replaced him with an exact double who threw the game.