I cannot recall a "most dangerous" label, as applied in the books of Gor. However, Tuchuks actually consider inter-tribal warfare a sport.
Then there are the Games of Love War, in which the losing opponent not only loses the girl, he might very well might be slain. I feel that a life-or-death game is the most dangerous of all!
I also recall a quote that limbs were often broken during the gaming events featured at the Torvaldsland Things.