Chess Boxing

Chess boxing is a hybrid sport combines chess with boxing in alternating rounds. The sport was seen for the first time at a boxing club in South London, after being conceived by siblings James and Stewart Robinson, both keen amateur boxers and club chessplayers. 
The modern concept of chess boxing was introduced in Berlin by Iepe Rubingh where it quickly developed a dedicated and enthusiastic following. He founded the World Chess Boxing Organisation (WCBO) in 2003 in Berlin and the first ever chessboxing club in 2005.
A full match consists of eleven rounds: six rounds of chess, each three (WCBO) / four (WCBA) minutes long, and five rounds of boxing, each three minutes long (four minutes under amateur rules).The match begins with a chess round which is followed by a boxing round. Rounds of chess and boxing alternate until the end of the match. There is a one-minute break between each round, during which competitors cool out and change gear.A competitor may win the match during a boxing round by knockout or a technical stoppage by the referee, by achieving a check mate or if the opponent's twelve minutes run out during a chess round, or by the opponent's resignation at any point. If a competitor fails to make a move during the chess round, he can be issued a warning after which he must make a legal move within the next 10 seconds or become disqualified. 
The players wear closed-back headphones during the chess rounds to avoid being distracted by the live chess commentary, or hearing advice shouted from the audience