Test your chess: Reitstein problem 44

White to play and win

C van der Westhuizen v R Toblansky 1978

Solution

The black king is in a net with Nf7 ’mate' threatened. The f7 square is defended only by the Qe7, which thus is tied to its function of defence. The fact that the Qe7 is LPDO means that the decoy 1 Qb4! has a big effect. The Qe7 must be defended, or must move, when the b7 falls. It's only a pawn, but a big enough breakthrough for a good advantage.

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