White to play. This is from Nakamura-Kramnik, Paris Blitz 2018. The third victim of Nakamura’s hypnotism was Vladimir Kramnik who, in a more or less balanced position, has just played his rook to d7. Why was this a horrible mistake? Answers via email to victoria@spectator.-co.uk by Tuesday 10 July. 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 Qxg7+
Last week’s winner John Samson, Edinburgh