Clarke MacArthur's goal late in the third period gave the Toronto Maple Leafs a 1-0 triumph over the visiting Pittsburgh Penguins Wednesday night. It appeared as if overtime between Pittsburgh and Toronto would be necessary for the second consecutive night until MacArthur took a pass from Mikhail Grabovski and deked around Brent Johnson with 6:05 to go in regulation. The Penguins edged the Leafs 5-4 in a shootout in Pittsburgh Tuesday night.