Colorado capitalized early in the second period to tie the score 1-1 as Montreal took consecutive penalties - carrying over from the middle frame. At 2:09, Richard was sent to the penalty box for hooking. The Avalanche executed quick puck movement as Cale Makar found Rantanen at the right faceoff circle and the winger sent a feed into the slot to Lehkonen where he turned and fired his shot past Allen's blocker at 2:16.
The Avalanche outshot Montreal 9-3 in the third period and 35-19 in regulation as they forced the game into overtime.
In overtime, Georgiev denied Jonathan Drouin in tight and Rantanen collected the loose puck. The Finnish winger turned and jetted up ice with Devon Toews for an odd-man rush. The pair exchanged a give-and-go and Rantanen wired a low wrister through Allen's pads at 1:51 into overtime to seal the two-point victory for Colorado.