no. 523
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Black to play. This position is from Potkin-Caruana, Dagomys 2010. How did Caruana finish off with a flourish? Answers to me at The Spectator by Tuesday 18 September 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 Qg8+

Last week’s winner Michael Koe, Wappenham, Northants