Premise: The 1920 Summer Olympics ( Les Jeux olympiques d'été de 1920 ) , officially known as the Games of the VII Olympiad , were an international multi-sport event in 1920 in Antwerp , Belgium . The Big Six in men 's international ice hockey are the six national teams that have been dominant in competitive play throughout the history of international hockey and especially since the 1950s . Ice hockey . In the early 1900s , the Canadian rules were adopted by the Ligue Internationale de Hockey sur Glace , the precursor of the IIHF and the sport was played for the first time in the Olympics in the Olympic Games of 1920 . In international competitions , the national teams of six countries ( the `` Big Six '' ) predominate : Canada , Czech Republic , Finland , Russia , Sweden and the United States . The National Hockey League ( NHL ; Ligue nationale de hockey -- LNH ) is a professional ice hockey league currently comprising 30 teams -- 23 in the United States and 7 in Canada -- with a 31st team in Las Vegas scheduled to begin play in the 2017 -- 18 season .
Hypothesis: Ice hockey has only local teams.
Label: CONTRADICTION