Hi guys,
Are the variations on ippon seoi nage you're referring to soto (outside) seio nage and uchi (inside) seoi nage? Uchi seoi nage is the normal throw ie, ippon seoi nage. Your head is postioned near your attacker's bicep. In soto seoi nage the attacker's arm is over your opposite shoulder, ie your head is on the "outside" of their arm, near the tricep. We sometimes use it against high thrusting attacks, eg attempted single-handed straight-arm strangle or a high punch.
Back to the topic of the post:
You mentioned that Atemi Jutsu is a derivative of Judo, Aikido and Karate. Ju jutsu was the forerunner of Judo and Aikido, and also gave rise to several Japanese styles of karate.
I study Tsutsumi Hozan Ryu Ju Jutsu as taught by Shihan Jan de Jong. The Tsutsumi Hozan Ryu originated around the mid 14th century. It is characterised by a very even balance of locks, throws and strikes. The style includes strangles, sacrifice techniques and weaponry. It resembles a very "hard" style of aikido or a "soft' style of Goju Ryu, and is somewhat similar to Wado Ryu.
It differs markedly from judo, being a combative style rather than a sportive one. For instance, there is very little reliance on actually gripping the clothing to effect a throw. In earlier times the style was classified as "kumi uchi". During the 1500's it was referred to as "kenden kumiuchi". The body movements, unbalancing, and techniques were designed for a multiple attacker environment. This is reflected in the training methods.
Tsutsumi developed a very effective method for training the reflexes. This reflex training is a trademark of the style. Tsutsumi also made use of yoko kaiten ukemi (sideways rolling fall). These are both peculiar to Tsutsumi Ryu. Neither the reflex training nor the sideways roll were taught outside of the school before Shihan de Jong's National and European seminars.
Steve Moller
"Thrice armed are they who know Ju Jutsu"