https://www.vice.com/en_us/article/z34qz8/chess-grandmaster-maxim-dlugy-admitted-to-cheating-on-chesscom-emails-show

Hans Niemann is one of the top-ranked chess players in the world and has, for the past two weeks, been at the center of an ever-widening scandal involving accusations of cheating at the game’s highest level. 

That scandal is now widening still more: Maxim Dlugy, one of Niemann’s coaches, was banned from Chess.com in 2017 and 2020 for repeatedly cheating in its tournaments, according to emails reviewed by Motherboard in which Dlugy admits to cheating. They include a lengthy explanation from Dlugy in which he says that students from his chess academy were watching him play in a Chess.com tournament, and that one of them was using a chess AI to feed him moves.