Wei Yi-Kacper Piorun, Fide World Cup, Goa 2025. Which surprising move enabled Wei to gain a decisive material advantage? Email answers to chess@spectator.co.uk by Monday 17 November. There is a prize of a £20 John Lewis voucher for the first correct answer out of a hat. Please include a postal address and allow six weeks for prize delivery.

Last week’s solution 1 Qe4+ Qxe4 2 Nd5 mate
Last week’s winner John Ward, Edinburgh
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