 Bob Hartley won his 400th NHL game as a coach with a 4–3 overtime victory over one of his former teams, the Colorado Avalanche, on December 4.The Flames overcame a third period deficit for the sixth time on the season to earn the victory, and were led by Dennis Wideman's two goals as he moved into the NHL's lead amongst defencemen, with ten.A couple weeks after reaching the milestone, on December 17, the Flames announced that Hartley had agreed to a multi-year contract extension with the team.