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 victoria@spectator.co.uk. 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