Tsunetane Oda, Kosen Judo, early 1900s

Tsunetane Oda (小田常胤 Oda Tsunetane, March 10, 1892 – February 11, 1955) was a Judoka who was influential in the development of Kosen Judo. His correct name was Join Oda, but through a misinterpretation of the kanji 常胤 he is more commonly known as Tsunetane. Oda is credited with the invention of the Judo technique Sankaku-Jime (三角絞), which was subsequently incorporated into other disciplines, including Brazilian Jiu Jitsu and Mixed Martial Arts as the 'Triangle Choke'.
Biography
Oda was born in Yamanashi Prefecture, Honshu, Japan in 1892. He started studying Judo in 1909 at the age of 17 at Numazu Kōtō Senmon Gakkō (高等専門学校 Higher Special School), joining the Kodokan the following year and receiving his 1st Dan in 1911.
Judo career
He excelled at Ne-Waza (ground work) and felt that it warranted greater emphasis than the Kodokan gave it. He worked with Hajime Isogai to develop the ground-work-emphasing style of Judo taught at the Kōtō Senmon Gakkō schools, known as Kosen Judo. It is said that Oda vision of Ne-Waza completed that of Kano's. He is credited with developing the strangulation technique Sangaku-Jime (三角絞?), in which the neck is compressed between the legs. This has been adopted into other martial arts and fighting systems including Brazilian Jiu Jitsu, and Mixed Martial Arts. The 'Triangle Choke' was said to be able to be applied in most directions. The 'Triangle Choke' was thought of as a sports technique rather than a battle technique in that an opponent could easily bite the groin if it were in the position.
Oda was awarded the rank of 9th Dan in Judo in 1948 and died in 1955.