A chess player at the centre of a cheating row gripping the game "likely" cheated in more than 100 games online, according to an investigation.
Hans Niemann has been accused by world champion Magnus Carlsen of cheating, though no evidence has been presented.
Now an investigation by Chess.com says it is likely Niemann has cheated "much more often" than he has acknowledged.
But it found no evidence he had cheated in his game against Carlsen or in any "over-the-board" games.
The American has admitted cheating in informal games when he was younger but denies doing so in competitive games.
The 19-year-old, who has been approached by the BBC for comment, has previously accused Carlsen and Chess.com of trying to ruin his career.
The scandal began earlier this month after Carlsen, considered by many to be the greatest player of all time, was defeated by Niemann at the Sinquefield Cup in a major upset.
The Norwegian made veiled accusations of cheating against Niemann at the time before openly accusing him last week.
Now Chess.com has produced a 72-page investigation into Niemann's games on the site, which most of the world's top players compete on, including for cash prizes.
The site, which has banned Niemann for alleged cheating, claims it is likely he cheated as recently as 2020, including in prize money events and against highly-rated "well known" figures in the game.