So, basically, Sonny Chiba is a mad martial arts genius. His over-the-top approach to both martial arts and movie fight scenes is best showcased in his 1974 breakout movie
The Street Fighter, in which his character gouges eyes, breaks limbs, punches a guy in the skull so hard that he dies, and thoroughly messes up another dude's junk. The three sequels,
The Return of the Street Fighter,
Sister Street Fighter, and
The Street Fighter's Last Revenge, are also recommended.