no. 531
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White to play. This is from Carlsen-Caruana, Bilbao 2012. Black has blundered right out of the opening. How did Carlsen gain a decisive advantage? Answers to me at The Spectator by Tuesday 13 November 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 ... Qxc4

Last week’s winner Bernard Golding, Newcastle upon Tyne