By Tara Subramaniam and Kevin Dotson, CNN

teenage chess grandmaster Hans Niemann “probably cheated” in more than 100 online matches, including those with cash prizes, according to a survey by one of the sport’s most popular websites.

The 72-page report by was released on Tuesday, a month after controversy erupted at a high-profile tournament when the world chess champion accused cheating 19 year old american.

According to the report, first mentioned by The Wall Street Journal, Niemann privately confessed to cheating on the website’s chess director in 2020, which led to him being temporarily banned from the platform.

The report says shut down Niemann’s account in September based on his previous admissions of cheating, suspicions about his recent play and concerns about his steep and inconsistent rise in rank.

“Although we have no doubt that Hans is a talented player, we note that his results are statistically extraordinary,” the report said.

Niemann previously publicly admitted to cheating in online matches when he was 12 and 16 years old, but the inquest alleged he cheated more recently.

Niemann did not respond to CNN’s request for comment. has millions of users and hosts over 10 million chess games daily, according to its owners. To detect suspicion of cheating, the website uses software that flags suspicious moves by comparing a player’s moves to those suggested by a chess engine. According to the report, less than 0.14% of gamers cheat on the site.

“I believe Niemann has cheated more – and more recently – than he has publicly admitted,” the 31-year-old Norwegian said. said in a report posted on Twitter.

“His progress above the board has been unusual, and throughout our game in the Sinquefield Cup I got the impression that he wasn’t uptight or even fully focused on playing in critical positions. , while surpassing myself as black in a way that I think only a handful of players can do. This game helped change my perspective.

Carlsen withdrew from the tournament after losing to Niemann. World chess governing body FIDE announced last week that it was investigating Carlsen’s allegations.

Chess on the chessboard is played face to face rather than online. Carlsen did not provide details on how Niemann might have cheated.

“I cheated on random games on I got confronted. I confessed. And that’s the biggest mistake of my life,” he said. “And I’m completely ashamed. I tell the world because I don’t want misrepresentations and I don’t want rumors. I’ve never cheated in a board game. And apart from when I was 12 years, I have never cheated in a tournament with prize money.”

According to the report, cheating in a widespread setting could involve “various methods such as: hand signals from a nearby coach or access to a phone in the bathroom, a device hidden in a shoe , or a registered wire or buzzer. to the body.”

The report says has not generally investigated cheating in board games, but it believes Niemann’s performance in some live games “deserves further investigation based on the data.”

“In our view, there is no direct evidence that proves Hans cheated in the September 4, 2022 match with Magnus, or that proves he has cheated in other OTB games in the past,” the report reads. report.

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