No. 816
White to play. Caruana-Firouzja, Sinquefield Cup, 2024. Caruana exchanged rooks, but soon ran out of checks and resigned before the b2 pawn could promote. Which move would have secured a draw here? Email answers to chess@spectator.co.uk by Monday 2 September. There is a prize of £20 for the first correct answer out of a hat.