Jakub Vrana scored the only goal in the shootout, and Vitek Vanecek made 18 saves for the Capitals (13-5-4), who won their season-high fourth straight game and extended their point streak to six games (5-0-1).
"I thought it was a good game. I mean it was tight out there," Washington coach Peter Laviolette said. "You know through probably 50 minutes of the game, the shots were low, the chances were really low, both sides. Defensively, I thought we were good. Offensively, we'll try to step on the gas a little bit more and they'll probably say the same thing. It was just one of those games that was tight. You had to play the game that was dealt, and that was the game that was dealt."
Tuukka Rask made 27 saves, including five in overtime for the Bruins (12-5-3), who lost for the fifth time in seven games (2-4-1).
"We stayed in the game, which at home you want to push the pace and the tempo, there's no doubt about that," Boston coach Bruce Cassidy said. "So [I'm] not going to sit here and say we're satisfied, but they've got a good team over there, we've got some young [defensemen] that have to understand what it's like to play against big guys, explosive guys, so I thought situationally we handled that well."