The Mexican professional wrestling promotion Consejo Mundial de Lucha Libre (CMLL; Spanish for "World Wrestling Council") has held a variety of different professional wrestling tournaments since it was founded in 1933. CMLL holds several as well as tournaments to either determine who should hold a championship or who should challenge for a championship. CMLL has also held some uniquely lucha libre tournaments, such as a "Losers Advance" Ruleta de la Muerte ("Roulette of death") tournament when the loser of the final match would be forced to either unmask or have his or her hair shaved off. As professional wrestling tournaments, they are not won and lost legitimately; they are instead won via a predefined outcome of matches.