The Great Conspiracy (1980)

Original title: Feng liu can jian xue wu hen

A knife expert arrives to tell the ruler he is to be invaded during his annual knife skills challenge. He coaxes his old enemy (a deaf, blind old man) out of hiding. In return he grants the hero the prize of the knife skills. He then goes off and has lots of fights with people, and makes friends with a woman who is pretending to be a man for unknown reasons.