These rules are for jiu-jitsu point tournaments. In any case, the following rules are typical. Competitive belt ranks are white, blue, purple, brown, black. Some tournaments do not have white belt competition. Weight categories are usually about 15 pounds.
Competitors begin standing on an open, padded mat surface.
Straight ankle and knee locks are usually allowed, but twisting ones are not. If time expires and no submission has occurred, then the competitor who has earned the most points wins. If time has expired and points are even, then it is a referee's decision, based on typical elements such as aggressiveness, control of the fight, minor progress, etc. Takedown from standing 2 points. Passing the guard 4 points.