Black to play. This position is from Shirov-Nakamura, Zurich 2016. Black is winning easily but now finished with a fine geometrical concept. What was the key move? Answers to me at The Spectator by Tuesday 1 March or via email to firstname.lastname@example.org or by fax on 020 7681 3773. 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 a6
Last week’s winner Stephen Walsh, Welsh Newton, Monmouth
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