Teenage chess grandmaster Hans Niemann "may have cheated" in more than 100 online matches, including those with prize money, according to an investigation by one of the sport's most famous websites.
A 72-page report by Chess.com was released on Tuesday, a month after controversy erupted at a top tournament when the world chess champion was charged with cheating by a 19-year-old American.
According to the report, which was first mentioned by the Wall Street Journal, Neiman privately admitted to cheating to the website's chief chess officer in 2020,
causing him to be temporarily banned from the platform.
Chess.com shut down Niemann's account in September over concerns about cheating, suspicions about his recent play, and a steep, erratic rise in his rank, the report said.
"While we do not doubt that Hans is a talented player, we note that his effects are statistically unusual," the report said.
Neiman previously publicly admitted to cheating in online matches between the ages of 12 and 16, but the investigation revealed he cheated more recently.
Neiman did not respond to CNN's request for comment.