Shidokan karate - also known as Japanese shidokan - was founded in 1978 by Yoshiji Soeno, an Oyama student who'd competed in the earliest days of kickboxing. The style combined Soeno's expertise in kyokushin, grappling and gloved competition into a unique and eclectic martial art that quickly found recognition on the knockdown circuit. In its most complete form, the so-called "triathlon of martial arts" takes the form of multi-round matches divided into bare-knuckle, kickboxing and jujitsu (MMA) intervals.
The sport found particular popularity in the United States, with the Shidokan USA organization making its home in Chicago. The city is the site of one of the most competitive martial arts event in the world - the US Shidokan Open. Recognized for its grueling standard of competition and high knockout rate, the tournament is one of knockdown karate's premiere proving grounds in the western hemisphere.