The rapper RZA, a founder of the Wu-Tang Clan, sat in a suite on the 48th floor of the Mandarin Oriental hotel overlooking Central Park, staring at a chess game through a pair of sunglasses. His hand was frozen a few inches above the board as he looked for a strategy to thwart his opponent.

Chess has long had an important role in the aesthetic of the Wu-Tang Clan, which has songs about the game. In “The Wu-Tang Manual,” a 2005 book about the group and its members, RZA (pronounced RIZ-a) wrote that chess is part of the Wu-Tang essence “because it’s a game of war  it’s about battle. And Wu-Tang was formed in battles, from challenging each other.”

RZA, 38, learned the game when he was 11, from a girl who, as he writes in the manual, also took his virginity. Though he and his cousin GZA, another founder of the group, both love chess, they did not play much when they were younger because, GZA said, they were too poor to own a board.

Image RZA Credit... Chester Higgins Jr./The New York Times

Now they play chess almost every day, and RZA, holder of the Hip-Hop Chess Federation belt  a trophy he picked up last fall at a tournament in San Francisco that featured rappers and martial-arts experts  is turning his interest into a business. On Monday he started WuChess (wuchess.com), a Web site where fans can play chess online, chat, see scores of their games and other personal information, and get news about RZA and Wu-Tang. RZA said that the site might one day offer monthly tournaments, with the winner playing him online.