Hans Niemann is an American chess grandmaster, born on June 20, 2003, in San Francisco, California. He became a FIDE grandmaster on January 22, 2021, at the age of 17. Niemann has quickly risen through the ranks and is currently ranked 20th in the world as of November 2024. He gained significant attention in September 2022 when he defeated the reigning World Chess Champion Magnus Carlsen during the Sinquefield Cup. This victory led to a controversy, with Carlsen accusing Niemann of cheating, although Niemann has denied these allegations. The incident sparked a lot of debate within the chess community. Niemann is also known for his presence on Twitch, where he streams his chess games and interacts with his audience. Despite the controversy, he continues to be an active and prominent figure in the world of chess.