Kosen judo (高專柔道 Kōsen jūdō) was a refinement of Kodokan judo that was developed and flourished at the Kōtō senmon gakkō (高等専門学校) (Kōsen (高專)) technical colleges in Japan in the first half of the twentieth century. Kosen judo's competition rules allowed for greater emphasis of ne-waza (寝技, ground techniques) than in mainstream judo and it is sometimes regarded as a distinct style of judo. Today, the term "Kosen judo" is frequently used to refer to the competition ruleset associated with it that allows for extended ne-waza. Such competition rules are still used in the shichitei jūdō / nanatei jūdō (七帝柔道 seven imperials judo) competitions held annually between the seven former Imperial universities.