The basic idea in chessboxing is to combine the #1 thinking sport and the #1 fighting sport into a hybrid that demands the most of its competitors – both mentally and physically.
In a chessboxing fight two opponents play alternating rounds of chess and boxing. The contest starts with a round of chess, followed by a boxing round, followed by another round of chess and so on.
A contest consists of 11 rounds, 6 rounds of chess, 5 rounds of boxing. A round of chess takes 4 minutes. Each competitor has 12 minutes on the chess timer.
A round of boxing takes 3 minutes. Between the rounds there is a 1 minute pause, during which competitors change their gear. The contest is decided by: checkmate (chess round), exceeding the time limit (chess round), retirement of an opponent (chess or boxing round), KO (boxing round), or referee decision (boxing round).