How many movies have Osamu Yamauchi and Rikiya Yasuoka acted in together?

They have worked on 2 movies together! Their first movie together was The Swindlers (1970) while their highest rated movie together was Yakuza Wolf 2: Extend My Condolences (1972). They have not worked together since Yakuza Wolf 2: Extend My Condolences (1972).