Until Sunday, the allegations had been limited to Canadian curlers, who represent one of the world's most fervent fan bases. Videos circulating on social media appeared to show both Canadian curlers double-touching the rocks but both teams denied wrongdoing. On Saturday, World Curling directed two umpires to move between the four matches during each round, monitoring play. World Curling does not use video replays for reviewing penalties during games. U.S. women's curlers had a different view.