Disqualifications occur when an opponent uses an illegal hold, move (such as the piledriver, which is an illegal move in lucha libre and grounds for immediate disqualification, though some variations are legal in certain promotions), or weapon, hits his opponent in the groin ("faul"), uses outside interference, attacks the referee, or rips his opponent's mask completely off. Most matches are two out of three falls ("dos de tres caídas"), which had been abandoned for title bouts in North America and Japan in the 1970s.