no. 434
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White to play. This is a position from Carlsen-Shirov, Biel 2011. Can you spot Carlsen’s crushing blow? Answers to me at The Spectator by Tuesday 15 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 ... g5

Last week’s winner Mark Nottingham, Ramsgate, Kent