No. 470
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White to play. This is from Breyer-Esser, Budapest 1917. White has a multiplicity of tempting options but the best move forces mate in nine. What is it? Answers to me at The Spectator by Tuesday 22 August or via email to There is a prize of £20 for the first correct answer out of a hat. Please include a postal address and allow six weeks for prize delivery.

Last week’s solution 1 Rc5

Last week’s winner Boris Alperowicz, South Nutfield, Surrey