Chess boxing is a hybrid sport that combines chess with boxing in alternating rounds. The sport was invented by Dutch artist Iepe Rubingh, who was inspired by a French comic book Le Froid Equateur by artist and filmmaker Enki Bilal. Chess boxing is a fast growing sport, with large followings in Berlin and London, where most events take place. Several other chessboxing events have taken place around the world, including in Los Angeles, Tokyo, Nantes (France), Reykjavík (Iceland), Amsterdam, Calcutta (India) and Krasnoyarsk (Russia). Participants must be skilled as both boxers and chess players, as a match may be won either way.