no. 516
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Black to play. This position is from Brown-Adams, British Championship, Bournemouth 2016. Black has various ways to force mate but only one move does the job in five moves at most. Can you find it? Answers to me at The Spectator by Tuesday 31 July 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 ... N4xd5

Last week’s winner Alex Burghart, London SW1