 Complete the following phrase:  He won the 1978 South African Grand Prix, with a last-lap victory over Patrick Depailler, as well as the Austrian Grand Prix, in the innovative ground effect Lotus 79. His teammate Mario Andretti won the Drivers Championship with Peterson acting effectively as the Team No. 2 with the pair scoring four 12 wins, all with Andretti at the lead. Both of Petersons wins occurred when Andretti encountered trouble, with Andretti winning once when Peterson failed to finish not including the 