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The pawn on g2

Bent Larsen vs Boris Spassky · Belgrade 1970 · Black to play and win

Black to play. Mate in 7.

Find the move Boris Spassky found. The other side answers by itself.

Bent Larsen vs Boris Spassky

Belgrade, 1970

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The game

Bent Larsen against Boris Spassky, Belgrade, 1970. The board above holds the position as it stood: Black to move, and mate in 7. Find the move that was played and the other side answers by itself, exactly as it answered then.

The story behind it, which gives the finish away

USSR against the Rest of the World, board one. Spassky gives a rook so that a pawn can reach g2, and the pawn decides the game in seventeen moves. Larsen resigned after the promotion.

Nearer the same years

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