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Toshihiko Koga shows a standard gripping for a right handed player against a left handed opponent. This also works left v right.
See how Koga gains the upper hand when grip fighting against a left handed opponent
Koga demonstrates Uchi komi for Seoi nage. Repeated Uchi komi is essential for mastering this technique
Koga's world famous technique was his incredible Ippon seoi nage. In this clip he goes through in detail all the fundamentals of the technique