Cordingley puzzle 75

White to play and win

Solution

An exercise in calculation, but since the first moves are obvious, and the analysis tree, in Kotovian terms, is whatever the opposite of a thicket is (think long branchless tree, tall but smooth trunk, only a few leaves at the top), it is none too hard. All one has to do is see that white's queen can escape to safety via g4, and them see Re6+! to prosecute the attack to a mating conclusion.

I was pleased I could see it from the start to mate, though I missed 27 Nb7+, instead in the last diagram playing 27 Qg5+ Re7 28 Qg8+, a manoeuvre that I have seen before.

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