chessnutz

(Our weekly chess puzzle.)
*************************Adolf Schweinhund versus Iosef Visarionivich.
Berlin 1939.
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Black thinks he's coasting on his extra piece. But White found a way to spoil the expected outcome. Can you spot it?
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Solution: Schweinhund invaded Poland, and the game had to be abandoned. In fact there were no more chess games for the next six years. After the war the International Chess Federation formally outlawed the strategy of invading Poland which it deemed to be unfair.