From The Interobang.com :
With large followings in London and Berlin, chess boxing brings brains and brawn into one sport. Rounds of chess and boxing alternate until the match ends with six rounds of chess and five rounds of boxing until they win by points, knockout, or checkmate. Players wear closed-back headphones during the chess portion to avoid being distracted by the crowd but a couple of blows to the head. The sport is slowly gaining traction around the world and RZA of the Wu-Tang Clan has admitted being a fan and even recorded a song called ‘Da Mystery of Chessboxin’. Can you get better praise than that?