A point is awarded for a scoring hit with marked part of the glove on the opponent's head (side or front) or body (above the belt).
A panel of five judges decides which hits are scoring hits.
Judges each have two buttons before them, one for each boxer, and they press the appropriate button when they believe a boxer delivers a scoring hit.
An electronic scoring system registers a point whenever three or more judges press the button for one boxer within a second of each other. No point is awarded for a hit unless three of the five judges agree.
When two boxers trade blows in a flurry of infighting, where no full-force punches can land, the judges wait until the end of the exchange and award a point to the boxer who got the better of it.
(From About)