The Sabres' top line of Taylor Hall, Jack Eichel and Sam Reinhart did not have a point.
"Yeah, they had so much opportunity, lots of chances, unbelievable puck control, and we need [the] Eichel, Reinhart, Hall line to just get one or two and I'm confident they're going to explode," Buffalo coach Ralph Krueger said. "They're just so dangerous, so lethal. Jack had [hit] a post in [regulation] time, [and] a post on his penalty shot."
The teams play again here Sunday in their fourth game of eight against each other. Washington has won the first three.
Staal gave the Sabres a 1-0 lead at 12:33 of the first period off a pass from Victor Olofsson, who stripped the puck from Capitals defenseman Zdeno Chara behind the Washington net.
Backstrom tied it 1-1 at 16:18 when he scored on a rebound.
Dowd gave the Capitals a 2-1 lead at 4:14 of the second period with a one-timer off a Vrana pass from the right corner.
"[Vrana] made a nice play and [Garnet] Hathaway had a good screen in front, and I was able to put it on net and it found some twine," Dowd said.