Sean Monahan scored 1:47 into overtime to lead the Calgary Flames to a 4-3 win over the Colorado Avalanche on Thursday night.
Monahan picked up a rebound in front and lifted it over fallen goalie Semyon Varlamov to give the Flames their fourth straight win.
Dennis Wideman had a pair of goals for the Flames, Curtis Glencross also scored, and Kris Russell had three assists.
Karri Ramo made his fourth straight start, and stopped 26 shots to improve to 8-2-1.
Calgary coach Bob Hartley earned his 400th NHL win, and he did it against his former team. Hartley earned 193 wins with Colorado from the 1998-99 season until he was let go 31 games into the 2002-03 campaign.
Matt Duchene, Nick Holden and Alex Tanguay scored for the Avalanche.