Chess boxing, or chessboxing, is a hybrid fighting sport (or a hybrid board game) that combines two traditional pastimes: chess, a cerebral board game, and boxing, a physical sport. The competitors fight in alternating rounds of chess and boxing. Chessboxing was invented by Dutch performance artist Iepe Rubingh. What was initially only thought to be an art performance quickly turned into a fully developed competitive sport. Chessboxing is particularly popular in Germany, Great Britain, India and Russia.