There is only one way the Capitals can lose their first-round playoff series against the New York Rangers and on Monday night they showed how. The Capitals went to the penalty box six times in the first two periods, giving the Rangers six power plays and keeping Alex Ovechkin glued to the bench. “Too much in the box,” Capitals defenseman Mike Green said. “The offensive guys are sitting on the bench and it takes some time to get some momentum.” In a span of just over 25 minutes, Ovechkin [roughing], Joel Ward [high-sticking], Mathieu Perreault [too many men], Braden Holtby [tripping], Jay Beagle [hooking] and Steve Oleksy [hooking] took penalties. And while the Rangers were only credited with one power-play goal by Derick Brassard, they scored another by Brian Boyle before Ward could get out of the penalty box and onto the ice. “Your momentum gets killed,” Beagle said, “and it’s tough to get going again. We need to keep our sticks down and stay off the refs.” It marked just the second time since January that the Caps gave an opponent six or more power plays in a game and it drew attention to their Achilles’ heel at the start of the season when they started 2-8-1.