Among the Pros the Cumulative method is preferred. Not only because they get to race more, it lessens the chance of luck playing as a factor in any given race event. In 1985 Greg Hill staged a personal boycott of ABA nationals in part of his dislike of the transfer system. Cumulative scoring is not only used in the ABA and NBL pro qualifying motos but in the mains, in which the pros are required to race the mains three times to win points and prize money. Cumulative scoring, also known as Olympic scoring, is used by the UCI in their international BMX program and was used in the 2008 Summer Olympics in Beijing, China for both amateurs and professionals. The ABA continues to use the Transfer System for its amateur classes.