by NBK Fri May 17, 2013 10:24 pm
Part of the problem with tracking those down is that there are so many similar if not identical techniques in many different schools.
Also, many judo techniques taken from other schools have been heavily modified. From time to time it is possible to track the origin of a technique to a particular school or schools, but only if you have a good library and read old Japanese, and a good understanding of the development of judo.
Here's an example from Tenjin Shin'yo ryu:
What's that? Osoto gari? Osoto otoshi? Hiki taoshi? Or something else?
Kano shihan himself wrote that many judo techniques came from Tenjin Shin'yo and Kito ryu, but also from many others not specified. One of the most interesting things to me is that he wrote that Kime no Kata was the basis of all of judo, and that its techniques came from a number of schools. He also noted that Ju no Kata was a kata to teach and practice the basics of attack and defense.
So, to me the most interesting techniques in judo are those lost from the early days the art itself.