Kosen judo (高專柔道, Kōsen jūdō?) refers to a set of competition rules of Kodokan judo with particular emphasis on ground grappling techniques such as pinning holds (osaekomi-waza), joint locks (kansetsu-waza) and chokeholds (shime-waza), referred to as newaza in Japanese martial arts.
Read more about Kosen Judo: Background, Kosen Judo Style, Bibliography