no. 490
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White to play. This position is from Ivanchuk-Lafuente, Gibraltar 2011. White now terminated proceedings abruptly. What was the key move? Answers to me at The Spectator by Tuesday 30 January 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 Rf8+

Last week’s winner James Stretton, Ilkley, Yorkshire