Black to play. Schwetlick-Lecroq, 32nd Correspondence World Championship. White’s last move, Qd1-b3, is a blunder that can’t have been endorsed by a computer. What did Black play to force resignation? Answers should be emailed to chess@spectator.co.uk by Monday 21 November. There is a prize of £20 for the first correct answer out of a hat. Please include a postal address.
Last week’s solution 1…Qh2! wins. Carlsen’s 1…Qc2 (or 1…Qd3) allows 2 Re7+ Ka6 3 Ra7+ Kxa7 4 Qe7+ Ka6 5 Qa7+ Kxa7 stalemate.
Last week’s winner David Grant, Ludlow
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