How many movies have Mona Fong Yat-Wah and Yiu Man-Kei collaborated on?

They have worked on 12 movies together! Their first movie together was Challenge of the Gamesters (1981) while their highest rated movie together was Long Road to Gallantry (1984). They have not worked together since Disciples of the 36th Chamber (1985). They are most known for their action films together.