How many movies have Sai Gwa-Pau and Yuen Yat-Choh acted in together?

They have worked on 9 movies together! Their first movie together was Duel of Fists (1971) while their highest rated movie together was The Boxer from Shantung (1972). They have not worked together since The Family Strikes Back (1986). They are most known for their action films together.