White to play. Giri–Nepomniachtchi, Chessable Masters 2020. Giri has sacrificed a knight to lure the black king forward. Which move forced a decisive breakthrough? Answers should be emailed to firstname.lastname@example.org by Monday 13 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 Qg8+ Rxg8 2 Nf7+ Qxf7 3 Rxh7+ Kxh7 4 Rh1 mate