There are no competitions under these rules. The goal in the competition is to win, inflict damage, and the goal in "uri kumi go" is not to lose, not to miss a blow, not to get injured. Therefore, only training fights are held when the instructor knows the level of the students and very closely monitors the course of the fight and certification fights with holders of the degree for which the student claims.
The fight lasts 2 minutes. The goal is to demonstrate the ability to withstand the pressure of an obviously more experienced opponent - the owner of the senior belt.
Children, of course, do not participate in such fights under 16 years of age, and after 16 years of age they participate only with the permission of the instructor, if he is confident in the preparation of the student.
For children a more important variant of the fight at their age is available tegumi - a struggle to unbalance.
This guarantees the acquisition of the most important skills: balance, feeling of a partner, control of the environment. Tegumi also develops physical strength very well.