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White to play. This is from Aronian-Mamedyarov, St Louis 2019. We are only just out of the opening but White has a killing blow. What is it? Answers to me at The Spectator by Tuesday 27 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 Ba4

Last week’s winner Cecil Taitz, London NW4