White to play. This position is from Karjakin-Caruana, Berlin 2018. This game was Caruana’s only reverse in Berlin. Karjakin now simplified down to a winning endgame. What was the key move? Answers via email to email@example.com by Tuesday 24 April. 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 Rc1
Last week’s winner Roy Bland, Penzance, Cornwall