Katami Waza (Groundwork).  Master Okada gets down to his real specialty - Katami Waza or Groundwork.  This is the meat and potatoes of Judo and it's what he spent so much time learning from Oda Sensei on those cold dark nights in a dojo in the 1940’s and 1950’s.

https://www.youtube.com/watch?v=_WnmG9jJSOk&t=15s