Black to play. This is from Carlsen-Polgar, Mexico City 2012. Black’s minor pieces seem to be locked out of the game but Polgar’s next move showed that this was not the case and it led to an easily winning position. What did she play? Answers to me at The Spectator by Tuesday 22 January 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 Rxd4
Last week’s winner Jens Knocke, Rouen

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