no. 504
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White to play. This is a possible variation from Meier-Carlsen, Grenke 2018. Meier could have forced a win in this game but missed his chance. What is White’s most accurate winning move? Answers to me at The Spectator by Tuesday 8 May 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 ... Ra3

Last week’s winner R.C.Teuton, Frampton Cotterell, South Gloucestershire