Chicago dominated the shot count 40-20 in regulation but Grubauer was outstanding stopping all but one to send it to overtime.
Keith went coast-to-coast and drove the net, burying his sixth goal of the season at 1:23 of the OT period for the win.
TALKING POINTS:
"It's the biggest game of the year. Every game you could say, probably, biggest game of the year from here on out. We've been saying that for a while and that showed, I think, in our desperation, our management with the puck and guys competing."- Duncan Keith on the feeling in the locker room after defeating Colorado
"It feels good. We got our two points and we just need to get ready for the next one. One game at a time...We played as a team today, four lines going. Everybody played the right way." - Artem Anisimov on Chicago's play against the Avalanche
WHAT'S NEXT:The Blackhawks hit the road for three games, beginning Tuesday night in Arizona against the Coyotes. The game, at 9 p.m. CT, can be seen on WGN-TV or heard on WGN 720.