Jose Theodore made 39 saves for the Capitals, increasing his club-record streak to 19 games (17-0-2) without a loss in regulation. With the victory, the Capitals tied the franchise points record of 108 set last season.
Alexander Semin and Eric Fehr scored about 2 minutes apart early in the third to give Washington the lead, but Jordan Staal countered with 3:06 left in regulation to force overtime. Bill Guerin and Maxime Talbot also scored for Pittsburgh.
At Denver, Peter Mueller and Chris Stewart had shootout goals for Colorado after Los Angeles overcame a late two-goal deficit to force overtime.
Los Angeles' Ryan Smyth had a chance to extend the shootout, but his shot clanged off the goal post to end the game.
Matt Hendricks, Milan Hejduk and Paul Stastny scored first-period goals, leading Los Angeles to pull starting goalie Jonathan Quick in favor of Erik Ersberg.
Alexander Frolov tied it on a power play with 1:21 left in regulation, and Anze Kopitar and Drew Doughty also scored for Los Angeles.
At Detroit, Valtteri Filppula scored with 6:49 left and added an empty-net goal, and Jimmy Howard made 30 saves to help Detroit moved four points ahead of Calgary for the eighth and final Western Conference playoff spot.
Henrik Zetterberg and Todd Bertuzzi also scored for the Red Wings, 9-2-1 since the Olympic break. Paul Kariya and Jay McClement scored for St. Louis.
At Vancouver, British Columbia, Daniel Sedin had a goal and two assists, twin brother Henrik added three assists, and Andrew Raycroft made 30 saves for Vancouver.
Christian Ehrhoff, Alex Burrows and Ryan Kesler also scored to help Vancouver bounce back from a loss to last-place Edmonton on Tuesday night. The win was just the Canucks' second in five games and kept them five points ahead of Colorado atop the Northwest Division. Henrik Sedin also moved back into the NHL scoring lead with 99 points, one more than Washington's Alex Ovechkin.
Saku Koivu broke up Raycroft's shutout bid 8 minutes into the third period.
At Buffalo, New York, Jason Pominville and Thomas Vanek scored in the shootout after Buffalo overcame a two goal deficit in the final 2 minutes of regulation.
Tim Connolly scored a power-play goal with 1:59 left in regulation, and Steve Montador tied it with 47.9 seconds left and goalie Ryan Miller off for an extra attacker.
Miller made with 26 saves to help the Sabres win their fourth straight game.
Andrei Kostitsyn scored twice, and Carey Price stopped 40 shots for Montreal.
At New York, Marian Gaborik had two goals and an assist, and Henrik Lundqvist made 27 saves for his third shutout of the season for New York.
Artem Anisimov, Michael Del Zotto and Dan Girardi for New York. The 10th-place Rangers moved within five points of eighth-place Boston, but have only nine games left.
