Black to play. This position is from Gelfand-Carlsen, Fidé Candidates London 2013. What was the key move that enabled Carlsen to make the most of his queenside pawns? Answers to me at The Spectator by Tuesday 16 April or via email to victoria@spectator.co.uk or by fax on 020 7681 3773. The winner will be the first correct answer out of a hat, and each week I shall be offering a prize of £20. Please include a postal address and allow six weeks for prize delivery.
Last week’s solution 1 Rh8+
Last week’s winner Nigel Clark, Romford

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