Duncan Keith's goal 1:23 into overtime gave Chicago a 2-1 victory over the Colorado Avalanche in a matchup of Western Conference playoff contenders.
Keith took a feed from Brandon Saad, bulled his way down left wing, shrugged off a check from Nathan MacKinnon and beat goaltender Philipp Grubauer between the legs to snap the Blackhawks' three-game losing streak.
Chicago pulled within five points of Colorado for the second wild card in the West, one night after the Avalanche beat the Blackhawks in the first game of their home-and-home set.
Artem Anisimov had a power-play goal for the Blackhawks, tying it 1-all early in the third period. Corey Crawford made 19 saves.
Alexander Kerfoot scored on a 5-on-3 power play for the Avalanche, who had won four straight.
Colorado has 81 points in the final wild-card spot. Arizona and Minnesota have 79, and Chicago has 76, with a game in hand on Colorado and Minnesota.
For the Avalanche, it was a squandered chance to put more distance between them and their pursuers.
Colorado didn't get a shot in overtime. The Avalanche controlled play for the first 50 seconds, but Chicago took control of the puck after a battle on the boards and it eventually came to Saad, who found Keith open on the left side.
The Blackhawks are at the Arizona Coyotes on Tuesday night.