What is Kosen Judo
Kosen judo, a variation of Kodokan judo, emerged in Japan during the early 20th century, primarily within the kōtō senmon gakkō (高等専門学校), or technical colleges, known as “kosen” schools, which educated students aged 15 to 20.
The term “Kosen” is an abbreviation of these higher specialty schools, and the style developed as a competitive ruleset emphasizing ne-waza (ground techniques) over the tachi-waza (standing techniques) prominent in mainstream Kodokan judo.
Origins and Development (Late 19th to Early 20th Century)
Kosen judo traces its roots to the establishment of kosen schools in Japan, which began holding judo competitions in 1898, four years after their founding.
These schools, designed to train technical professionals, adopted judo as part of their curriculum, influenced by Jigoro Kano’s Kodokan judo, founded in 1882.
Kano’s judo synthesized techniques from various jujutsu schools, including ground-based methods from Fusen-ryu, founded by Takeda Motsuge in the early 1800s, which emphasized unarmed combat and ne-waza due to the decline of samurai-era armed fighting.
By 1914, Kosen schools formalized their inter-collegiate competitions with the Kosen Taikai (高專大会), which ran annually until 1944. The ruleset, based on pre-1925 Kodokan and Dai Nippon Butokukai regulations, diverged from mainstream judo by allowing greater freedom in ground fighting.
Competitors could transition directly to ne-waza without a recognized throw doing a hikikomi(guard pull) and remain on the ground without time limits, and use techniques like leg grabs and certain joint locks (e.g., leglocks and neck cranks, though ashi garami was prohibited) that were later banned in Kodokan competitions.
This ruleset favored tactical ne-waza, enabling less skilled judoka to neutralize stronger opponents by dragging them to the ground for draws or submissions.
Prominent judoka like Tsunetane Oda and Yaichihyōe Kanemitsu, associated with kosen schools, refined ne-waza techniques, contributing to the style’s distinct identity. The Kyoto region became a hub for kosen judo, with some schools specializing entirely in this approach until around 1940.
The emphasis on ground techniques led to sophisticated strategies, including positions like the closed guard, half-guard, and turtle, which were extensively developed long before their popularization in other martial arts.
Tensions with Kodokan and Rule Changes (1920s)
The popularity of Kosen Judo’s ne-waza-heavy approach sparked concerns from Jigoro Kano, who founded Kodokan Judo with a balanced emphasis on throws, pins, and submissions for both sport and self-defense.
By the 1920s, kosen competitions often saw weaker students exploit ground fighting to secure draws, frustrating Kano’s vision of judo as a holistic discipline.
In 1925, the Kodokan introduced stricter rules limiting ground fighting time and restricting entries to ne-waza, aiming to re-emphasize tachi-waza. By 1929, the Kodokan replaced draws with decision victories (yusei-gachi) to further discourage passive ground strategies.
Kano reportedly criticized kosen judo in 1926, arguing it produced judoka skilled in sport but less effective in self-defense.
Despite these changes, Kosen schools maintained their original ruleset, preserving the emphasis on extended ne-waza. This divergence led some to view kosen judo as a distinct style, though it remained a ruleset variation within Kodokan judo rather than a separate system.
The influence of Kosen Judo’s ground focus is evident in the techniques of judoka like Masahiko Kimura, who later demonstrated its effectiveness in his famous 1951 match against Helio Gracie in Brazil.
Post-War Evolution and the Nanatei Judo League (1950s–Present)
The kōtō senmon gakkō system was abolished in 1950 due to post-World War II education reforms, but kosen judo’s legacy continued through the seven former Imperial Universities (Tokyo, Kyoto, Tohoku, Kyushu, Hokkaido, Osaka, and Nagoya).
In 1952, these universities established the Nanatei Jūdō (七帝柔道, Seven Emperors Judo) competition, adopting the kosen ruleset.
This annual tournament, still held today, features teams of 20 judoka competing in six- or eight-minute matches, with victory determined by ippon (pin, submission, or perfect throw) or draws, and a kachi-nuki shiai format where winners remain on the mat.
Kyoto University has dominated, securing 22 wins and three draws out of 66 editions as of 2017.
Kosen judo’s rules continue to allow hikikomi, unrestricted gripping (including legs and trousers), and extended ne-waza without activity requirements, contrasting with modern International Judo Federation (IJF) rules, which prioritize standing techniques and limit groundwork.
Techniques like leglocks were permitted until 1925, and some sources suggest neck cranks and other joint locks remained legal in kosen competitions longer than in Kodokan rules, though specifics vary.
Influence on Brazilian Jiu-Jitsu and Modern Resurgence
Kosen judo’s focus on ne-waza has drawn comparisons to Brazilian Jiu-Jitsu (BJJ), sparking debates about its influence. Mitsuyo Maeda, a Kodokan judoka specializing in ground fighting, taught judo to Carlos Gracie in Brazil around 1919–1920, contributing to the development of Gracie Jiu-Jitsu, which evolved into BJJ.
However, Maeda left Japan in 1904, before the formal establishment of kosen judo in 1914, making it unlikely he trained under kosen rules.
His exposure to catch wrestling and other grappling styles during his travels likely shaped the techniques he passed to the Gracies, blending Kodokan judo with external influences.
While kosen judo and BJJ share similarities (e.g., guard pulling, submissions), BJJ evolved independently with innovations like the De la Riva guard and berimbolo, distinct from kosen’s more traditional flow.
The 1951 Kimura vs. Helio Gracie match highlighted kosen judo’s ground techniques, as Kimura, a kosen practitioner, used ne-waza to defeat Gracie, influencing BJJ’s development by demonstrating judo’s groundwork efficacy.
Recent interest in kosen judo has surged due to these similarities, with dojos like Yasuragi and programs like Gatame Kosen Judo, led by Joichi Hirao, working to preserve its techniques.
However, Kosen judo remains less popular than modern Kodokan judo or BJJ, with its practice largely confined to Japan’s Nantai competitions and select international groups.
Wrap Up
Kosen Judo emerged as a ne-waza-focused variation of Kodokan judo in Japan’s technical colleges, formalized in the early 20th century through the Kosen Taikai.
Its permissive ground-fighting rules diverged from Kodokan’s stricter regulations, leading to a distinct competitive style preserved in the Nanatei Judo league.
While it shares similarities with BJJ, its direct influence is limited, though its legacy endures in modern judo and grappling communities through dedicated practitioners and renewed interest in traditional techniques.
Bobby is martial artist for almost 20 years with a BJJ black belt under Professor Sergio Miranda. He is also a karate black and former combat sports athlete, who loves all things grappling.