Testing fights in a vertical posture

A fight is conducted on a soft surface (preferably on tatami mattresses) until one of the competitors wins in four scuffle. The contest area is made of space within a circle with a diameter of 3.6 m. Each scuffle aims at pushing the opponent outside the contest area or making him/her touch the ground with a part of the body other than feet. Any resumption of the fight is when the opponents assume a posture of a supported squat on both fists in the middle of the contest area and start fighting at a signal. Breaks between fights stem from the duration of individual duels (a break cannot be shorter than the time of the previous fight).