How many movies have Viktor Knapp and Václav Trégl collaborated on?

They have worked on 3 movies together! Their first movie together was Námluvy komtesy Gladioly aneb Přistání ve skleníku (1970) and was their highest rated movie together. They have not worked together since Tetička za všechny peníze (1973). They are most known for their tv movie films together.