Jordan Staal scored twice as the Penguins came back in the third period to beat the Chicago Blackhawks, 4-1, in a preseason game tonight at Consol Energy Center. The Penguins are 2-0 in the exhibition season. The game was scoreless until 10:32 of the second period, when Michael Frolik stepped around Penguins defenseman Zbynek Michalek in the slot and whipped a shot by goaltender Brent Johnson for a 1-0 Chicago lead. Staal tied it for the Penguins, 1-1. Nick Johnson, in the crease, got his stick on a shot by Tyler Kennedy and the puck squirted out to Staal in the left circle. He swept it into a gaping space behind Blackhawks goaltender Ray Emery at 1:58 of the third period.