no. 505
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White to play. This is from Sadler-Speelman, 4NCL 2017. White is two pawns down in this endgame but all Black’s pieces are stuck on the back rank. White needs one accurate move to finish the game. Can you see it? Answers to me at The Spectator by Tuesday 15 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 Be6

Last week’s winner Mick Beirne, London E7