Holtby became the second-fastest goalie in NHL history win 200 games, reaching it in 319 games, 10 more than Ken Dryden of the Montreal Canadiens, who earned his 200th win in his 309th game, on Nov. 16, 1977.
"Obviously, it's an honor to be in the same sentence as him," Holtby said. "But I think with him and me that those teams that we've been fortunate to play on helped you get there. That's just luck in some ways. It's been a fun time to get to 200 and we move forward now."
WATCH: [All Penguins vs. Capitals highlights]
John Carlson and T.J. Oshie scored on the power play for the Capitals (9-7-1), who have won four of their past five. Chandler Stephenson and Jakub Vrana scored third-period goals.
"We're getting better and better every game," Holtby said. "Tonight was a strong effort in a lot of areas. It's a good sign showing that we're maturing as a group and we still need to push forward."
Phil Kessel scored for the Penguins (9-7-2), and Matt Murray made 27 saves. Pittsburgh has lost two of three.
Carlson scored at 14:09 of the first period to put Washington ahead 1-0. He shot from the top of the right circle and beat Murray blocker side with Oshie and Backstrom setting screens in front.
"We were a little nastier around the net. I think we had a lot more quality grinding it out in front when the pucks get there," Carlson said. "That takes a toll. We move the puck so well, it's easy to count on seam passes for one-timers and stuff, but sometimes that threat of clogging it up in the middle and those second-chance opportunities are big too."
Kessel tied it 1-1 at 8:26 of the second period. His pass in front was deflected in by Washington defenseman Dmitry Orlov.