UFC 1: The Beginning by

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The Ultimate Fighting Championship (later renamed UFC 1: The Beginning) was the first mixed martial arts event by the Ultimate Fighting Championship (UFC), held at the McNichols Sports Arena in Denver, Colorado, United States, on November 12, 1993. The tournament featured fights with no weight classes, rounds, or judges. The three rules – no biting, no eye gouging, and no groin shots – were to be enforced only by a $1,500 fine. The match only ended by submission, knockout, or the fighter's corner throwing in the towel, although the referee stopped the first fight at 26 seconds.