Bare Knuckle Karate is a unique combat sport. Where combatants fight with no protection (other than mouth guard and groin protector). Hand techniques are prohibited to the face and neck, but all else is allowed (hand techniques to torso, all leg and knee techniques allowed to head and body). Very few can argue that this style is one of the most difficult forms of combat. Check out Artur Hovhannisian, one of Kyokushin's top fighters. He is the 8th man to finish the 100 man kumite.