 However, concerns were raised that the new rule may possibly hinder teams that are more defence-oriented, an opinion echoed by the Canadian Curling Association.Since the Canadian Open is a Grand Slam event, the Open carried many points on the Canadian Team Ranking System, which plays a role in determining Olympic trials participants.If a team were to miss qualifying for the 2013 trials because of a poor performance at the Open influenced by the five rock rule, the team could raise complaints to the CCA.