White to play. Salem-Vrolijk, Tata Steel Challengers 2024. Black’s last move, Qf2-c2, was a fatal error in an otherwise drawn endgame. Which queen check won White the game? Email answers to chess@spectator.co.uk by Monday 12 February. There is a prize of £20 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 Rc8! Qxc8 2 Nb6+ wins, or 1…Qh7+ 2 f5 and the pawn promotes.

Last week’s winner Graham Baker, Campsea Ashe, Suffolk