Marian Hossa and Dave Bolland also connected for the Blackhawks, who won their second straight and are 4-0-1 in their last five.
Jason Pominville scored both goals for Buffalo, but it wasn't enough to keep the Sabres from extending the team's record road-losing streak.
Toews has goals in three straight games, and four goals and three assists in a five-game point streak.
Corey Crawford made 25 saves in the win. Buffalo's Jhonas Enroth stopped 29 shots.
In Montreal, Michal Neuvirth made 31 saves for his second shutout of the season and Alex Ovechkin scored his 19th goal on a power play midway through the second period to lift Washington over Montreal.
Mathieu Perreault and Marcus Johansson scored first-period goals for Washington, which bounced back from a 3-0 home loss to the New York Islanders on Tuesday to win for the third time in four games.
Ovechkin drove a slap shot from the right point through traffic and past Carey Price for his 19th goal.
Neuvirth, who made his first start in 11 games, recorded his sixth NHL shutout. It was his first since a 26-save effort in a 1-0 win in Winnipeg on Dec. 15.
Price stopped 13 shots for Montreal, 4-10-1 in its past 15 games - the last 14 under interim coach Randy Cunneyworth.
In Denver, Ryan O'Reilly scored 3:55 into overtime, as his shot trickled through the legs of Florida goalie Jose Theodore, and Colorado rallied to win.
Paul Stastny tied it late in regulation, and Peter Mueller scored twice - his first goals since April 2010. Mueller has been dealing with concussion-like symptoms the last two seasons, missing all of 2010-11 and a good portion of this season.
The Avalanche caught the Panthers on a rush late in overtime, with O'Reilly shooting a puck right at Theodore, who couldn't corral it.
Stephen Weiss, Marcel Goc and Tomas Kopecky scored for the Panthers, who lost their seventh straight road game. They haven't won in Denver since Jan. 2, 2003.
In Anaheim, California, Francois Beauchemin tied a career high with two goals, Jonas Hiller stopped 25 shots, and Anaheim beat Phoenix.
The Ducks are 6-0-1 in their past seven games, matching the club's longest point streak since November 2010.
Anaheim All-Star Corey Perry had a short-handed goal, and Niklas Hagman, Jason Blake and Matt Beleskey also scored for the Ducks (16-22-7), who won their fourth straight at home. Lubomir Visnovsky, Andrew Cogliano and Nick Bonino all had two assists.
Kyle Chipchura and Daymond Langkow scored for the Coyotes (21-19-7), who are 0-3-3 in their last six on the road. Mike Smith allowed all six goals on 21 shots - including four on just 10 total shots in the final two periods.
The Coyotes' road skid matches their longest since March 6-28, 2009.
Beauchemin posted his third career two-goal game and first since March 14, 2007.
