Cordingley puzzle 21

White to play and win

Solution

In the game, white erred, playing e8(Q), allowing a perpetual.

I suspect this is an occasion where it is easier to know that it is a puzzle: so there has to be a trick, a catch, something special. So the solution was fairly straightforward.

When I looked at the game briefly with an engine, I saw that it was fairly error strewn: a tense, double edged game; maybe the ending was in time trouble.

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