How many movies have Chu Siu-Boh and Mona Fong Yat-Wah collaborated on?

They have worked on 4 movies together! Their first movie together was The Cunning Hustler (1978) while their highest rated movie together was The Best Hustler Wins (1979). They have not worked together since The Last Judgement (1979). They are most known for their comedy films together.