In 1971, the penalty point system was first introduced into eventing. This system converts the dressage score and all jump penalties on cross-country and show jumping into penalty points, with the horse and rider with the fewest points winning the event. Different weight is given for each phase, with the cross-country — the heart of eventing — being the most important, followed by the dressage and then the show jumping. The intended ratio of cross-country:dressage:show jumping is theoretically 12:3:1. Therefore, an error in cross-country counts heavily. This prevents horses that are simply good in dressage (for example) from winning the event with a poor cross-country test.