It’s Your Move: daily chess puzzle # 70

White to play and win

Korchnoi v Gligoric, Yugoslavia-USSR 1963

Solution

A nice piece of calculation is all that is needed here. 1 Nf7! demands to be played, and the only question is 'is it winning after Qb7+ and the queen exchange?'. 1….Qf7[] 2 Qc8+ Ke7[] 3 Qb7+ Kf8 (say) 4 Qf7+ Kf7 and then it is clear that the a pawn promotes: 5 a5 and the Bd4 can't get back in time.

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