The Chicago Blackhawks, the hottest team in the NHL, were vulnerable Sunday. The Detroit Red Wings had ample opportunity to take full advantage. But, they had to settle for one point. Nick Leddy fired a wrist shot past Jimmy Howard with 2:15 to play in overtime to lift the Blackhawks to a 2-1 win at the United Center. Chicago improved to 6-0, establishing a new franchise record for most wins to start the season. Detroit's power play, which showed some life in the previous game, reverted to its passive, mistake-prove, momentum-draining ways, going 0-for-6. Detroit learned shortly before game time that speedy, energetic third-line center Darren Helm had a setback with his back injury and couldn't play. Patrick Eaves replaced him on the third line, where Justin Abdelkader moved from wing to center. Johan Franzen tied it at 1-1 at 4:30 of the third period, firing a shot through Corey Crawford's five-hole after picking up the rebound from a shot by Damien Brunner, who was set up by Henrik Zetterberg. It was Franzen's first goal of the season. Franzen escaped injury during the second period when he appeared to be inadvertently speared in the ribs by Dave Bolland in front of the Blackhawks net during Detroit's two-man advantage.