American chess grandmaster, 19-year-old, Hans Niemann, has been accused of cheating in more than 100 chess matches.

In early September, Niemann’s chief opponent and accuser, Magnus Carlson, lost a match to him and accused him of suspicious activity during their Sinquefield Cup tournament in St. Louis.

Further investigations confirmed Niemann had in-fact cheated on the online chess matches. He publicly admitted to cheating in online platforms when he was 12 and 16 years old.

In early October, Chess.com issued a report rejecting Niemann’s narrative, stating, “Hans has likely cheated in more than 100 online chess games, including several prize money events. He was already 17 when he likely cheated in some of these matches and games. He was also streaming in 25 of these games.”

This latest scandal harkens back to past chess scandals where Borislav Ivanov allegedly hid a small vibrating device in his shoe or Igor Rausis who was photographed analyzing and strategizing in the bathroom.

As of now, there has been no evidence found of him cheating against Magnus Carlson.These accusations have tarnished the reputation of both his and his mentor Maxim Dlugy. Dlugy spoke about the allegations in an interview and said and said they were “reprehensible , ridiculous, and slanderous.”

Last week, Niemann filed a federal lawsuit accusing Carlsen of maliciously colluding with others to defame and ruin his career.

Niemann wants a federal court to award him at least $100 million in damages. Defendants in the lawsuit include Carlsen, his company Play Magnus Group, the online platform Chess.com and its leader, Danny Rensch, along with grandmaster Hikaru Nakamura.