How many movies have Butt Yiu-Kwong and Peter Cheung Yiu-Chung collaborated on?

They have worked on 16 movies together! Their first movie together was Millionaires' Express (1986) while their highest rated movie together was Righting Wrongs (1986). They have not worked together since The Legend of Drunken Master (1994). They are most known for their action films together.