Prost's development work helped the 641 chassis to be extremely fast and competitive, and he scored five wins, including a remarkable victory from 13th place on the grid in Mexico, and challenged his nemesis Ayrton Senna for the championship. In the same race, Mansell outfoxed Gerhard Berger with a daring passing move at the fearsome Peraltada corner.[5] Although the car occasionally struggled in qualifying, it appeared to have the edge on the McLarens in race trim, particularly at high-speed circuits.[6] At the British Grand Prix, Mansell dominated qualifying while Prost struggled.