Amateur Boxing
RulesOlympic-style boxing, run internationally by World Boxing (which took over from the expelled IBA) and nationally by federations such as USA Boxing. Elite bouts are 3 rounds of 3 minutes, women and youth boxers wear headguards, and scoring emphasizes clean punching.
Rules Guide
Boxing Rules: Scoring, Fouls & Weight Classes
How this fits with the rest of the rules — the 10-point must system, fouls and penalties, and every weight class.