Also known as a body parts tourney. Each fighter has to collect a "body part": left leg, right leg, left arm, right arm, body and head. It's run like a meat grinder. During a bout each fighter's blows to various body parts (limbs etc.) are recorded. The loser of the bout stays on.
If you happen to kill your opponent with blow to the head, but you've already "collected" a head, the bout still ends. The first person to collect all body parts is the winner.
This type of tourney may turn the tables a little on those who may normally win all the time by using one shot (say, a nice fast snap to the head).