Mr Kramnik, 50, retired from classical chess in 2019. He attained GM status in the 1980s before Tim Berners-Lee invented HTML. He was a world champion in the early 2000s before online play was a big deal.
He has spent the last few years mounting an increasingly unhinged campaign against cheating. Apart from Danya, Mr Kramnik has accused Erigaisi, Sarin, Nakamura, Czech GM David Navara and many others, including several underage prodigies, of cheating.
Cheating online involves consulting computers on the sly. It can be detected in many ways. One is statistical analysis, which flags high coincidence in computer suggestions and moves made by cheats. Another is a cheat’s inability to play as well in physical, over-the-board (OTB) games. Thousands of online accounts are terminated every month for cheating.