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A unanimous decision (UD) is a winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts and other sports involving striking in which all three judges agree on which fighter won the match.
In boxing, each of the three judges keep score (round by round) of which fighter they feel is winning (and losing). A decision is not required to be unanimous for a boxer to be given a victory. Unanimous decision shouldn't be confused with a majority decision or split decision.