no. 520
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White to play. This position is from Nakamura-Mamedyarov, St Louis 2018. Unfortunately for Mamedyarov, he has just blundered in a winning position. How did Nakamura exploit his lapse? Answers to me at The Spectator by Tuesday 28 August 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 Bc4

Last week’s winner Richard England, London