Two cars are on the course at the same time, taking turns as the lead car and the chasing car. This is an offensive/defensive setup designed to find out who can drift best under pressure. The lead car must avoid the chasing car and at the same time execute an ideal drift; meanwhile, the chasing car is trying to mess up the lead car by getting in its way and is also trying to achieve its own ideal drift. A driver who spins out or causes contact automatically loses the tandem run. In case of competitions, tandem runs judges award points comparatively, so one driver always comes out on top.