The forthcoming world championship match, which begins in Astana on 9 April, was described by Garry Kasparov as an ‘amputated event’. The abdication of Magnus Carlsen, who remains the world’s strongest player, is of course a disappointment. But the 14 game match between the world number 2 and 3, respectively Ian Nepomniachtchi from Russian and Ding Liren from China, remains a gripping prospect.