White to play. Grischuk-Firouzja, World Blitz Team Championship, London 2025. A bishop up, Firouzja seems to have everything covered. Which move allowed Grischuk to save the draw? Email answers to chess@spectator.co.uk by Monday 23 June. 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 Kb8! wins, e.g. 1…Nd7+ 2 Kc8 Nb6+ 3 Kd8 or 1…Nc6+ 2 Kc7 Nb4 3 Kb6 Nd5+ 4 Kb5.

Last week’s winner Mark Jenkins, Cardiff