Prove it, “likely” doesn’t cut it. After reading about this over the past week there is a lot of chess-politics at play, a sore loser among them. Maybe they will run Niemann out for beating their favorite but that doesn’t mean or prove he cheated.
There is Niemann's Sept. 6 admission after Round 5 of the Sinquefield Cup that he cheated online at ages 12 and 16.
The rest is "likely cheated," "appears to have cheated," and "suspect games". No evidence whatever of cheating over the board at any time has been alleged. It was alleged that he "likely" cheated up to 42 days after his 17th birthday. No allegation of cheating as an adult was alleged.
Magnus Carlsen lost to Hans Niemann on Sept. 5. On Sept. 5 at 6:20 PM Chess.com emailed Hans Niemann "Chess.com has elected to privately remove access from your account on Chess.com, and we are rescinding the invitation to join the CGC [tournament] per your qualified spot. Chess.com retains the right to close/remove access to any account at anytime without explanation — https://www.chess.com/legal/user-agreement — see “Termination”."
Chess.com had an offer accepted to acquire Play Magnus for $80M and the acquisition is in progress.
After losing to Niemann, Carlsen withdrew from the round robin tournament via tweet. In the next tournament, Carlsen played one move against Niemann and resigned.
The Chess.com method of statistical analysis is secret, not published, not peer reviewed, not generally accepted by the scientific community, and not acceptable by FIDE (the International Chess Federation) or courts.
Niemann played his first round game today at the U.S. Championship and won, streamed on Chess.com.