Carlsen accused Niemann of cheating in a match they played against each other in September, and the ensuing fallout has caused a major stir in the chess world. Niemann is seeking $100 million or more in damages after accusing Carlsen, online chess platform chess.com and Hikaru Nakamura of “egregiously defaming him and unlawfully colluding to blacklist him from the profession to which he has dedicated his life.”