no. 537
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White to play. This position is from Jones-McShane, UK Knockout, London 2018. White’s next move was the start of a clever geometrical combination that wrecked the black position. What did he play? Answers to me at The Spectator by Tuesday 22 January 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 ... Rd2

Last week’s winner Tim Leeney, Hartfield, East Sussex