Shoot boxing rounds is one minute. The length of a Freshman class match is three rounds of three minutes each, followed by one or two three-minute rounds in the event of a tie. The interval between rounds is also one minute. Professional shoot boxers are divided into weight classes as follows: Sparrowweight was divided into Flyweight and Super flyweight, and Eagleweight was divided into Heavyweight and Super heavyweight since 2001. One way to win a shoot boxing match is to knock one's opponent out. A fighter can be knocked out in different ways. If, after being knocked down, a fighter fails to
Boxing respond that such a position is misguided opinion, stating that amateur boxing is scored solely according to total connecting blows with no award for "injury". They observe that many skilled professional boxers have had rewarding careers without inflicting injury on opponents by accumulating scoring blows and avoiding punches winning rounds scored 10-9 by the 10-point must system, and they note that there are many other sports where concussions are much more prevalent. In 2007, one study of amateur boxers showed that protective headgear did not prevent brain damage, and another found that amateur boxers faced a high risk of brain