White to play. Karthikeyan–Tabatabaei, Qatar Masters 2024. With his next move, Karthikeyaninitiated a winning combination. What did he play? Email answers to chess@spectator.co.uk by Monday 20 January. There is a prize of a £20 John Lewis voucher for the first correct answer out of a hat. Please include a postal address.

Last week’s solution : 1 Qb4! After 1…Kd6 or 1…Kd5 2 Qxc5# After 1..d6 or 1…Kf5 it’s 2 Qe4#. Or 1…f5 2 Qd4#, or 1…d5 2 Qf4#
Last week’s winner Alfred Shaw, Thornley, Lancashire
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