Magnus Carlsen said on Monday he believed Hans Niemann had "cheated more - and more recently - than he has publicly admitted", adding he no longer wanted to play against the American and any rivals who repeatedly cheated in the past. The 31-year-old Norwegian resigned at the Julius Baer Generation Cup last week after one move against Niemann, who lags him by almost 200 Elo points - the rating system used to calculate the relative skill levels of players. "So far I have only been able to speak with my actions, and those actions have stated clearly that I am not willing to play chess with Niemann," Carlsen said in a statement on Twitter.