The format of the sport underwent major changes in 2004 and 2005, with the creation of the "short" or "modified format", which excluded phases A, B, and C from endurance day. The primary reason for excluding these phases was that the Olympic Committee was considering dropping the sport of eventing from the Olympics because of the cost and large area required for the speed and endurance phase with a steeplechase course and several miles of roads-and-tracks. To prevent the elimination of the sport from the Olympics program, the "short format" was developed by the FEI. The last Olympic Games that included the long, or "classic", three-day format was the 2000 Summer Games in Sydney, while Rolex Kentucky, the Badminton Horse Trials, and Burghley Horse Trials ran their last long format three-day in 2005. The short format is now the standard for international competition, such as the Olympics and World Equestrian Games.