Chess boxing is a hybrid sport which combines the sport of boxing with games of chess in alternating rounds. Chess boxing fights have been staged since the spring of 2003.
A match between two opponents consists of up to eleven alternating rounds of boxing and chess sessions, starting with a four-minute chess round followed by two minutes of boxing and so on. Between rounds there is a one minute pause, during which competitors change their gear. The form of chess played is speed chess in which each competitor has a total of twelve minutes for the whole game. Competitors may win by knockout, checkmate, a judge's decision or if their opponent's twelve minutes of chess time elapses. If a contestant does not make a move in the chessround, he will be issued a warning by the referee. At the second warning the contestant will be disqualified.