White to play. Erigaisi–Liem, Tata Steel Rapid, 2021. Here 1 Rxf6? Qd1+ sees White getting mated on the back rank. The 18-year-old Indian grand-master found a much stronger move. What did he play? Email answers to chess@spectator.co.uk by Monday 29 November. There is a prize of £20 for the first correct answer out of a hat.

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