Eichel gave Vegas a 1-0 lead with a power-play goal at 4:04 of the first period, scoring on a one-timer from the top of the left face-off circle.
Hintz tied it 1-1 on the power play at 6:19 with a tip-in of Dadonov’s shot at the top of the crease.
Robertson gave Dallas a 2-1 lead at 7:31 of the second off the rebound of Duchene’s shot as he skated through the slot.
“They outcompeted us in the second period,” Golden Knights coach Bruce Cassidy said. “I thought the first was a fairly even game, not a lot going on, both power plays get a goal and the second period they turned it up a notch. We weren’t able to handle it. Breaking out below the goal line was an issue. It cost us a penalty. First period they score on some other opportunities and then again later in the second another goal that starts with that. They were good putting pressure on us, they do it well, they forecheck well.
“But once that breaks down you have to be able to take care of the front of your net, clear it out, find some loose pucks and settle things down. We weren’t able to do that and that’s been a bit of our stretch where one goal turns into two or three and now, you’re chasing. So, a bit of that is on the group to recognize it.”
Shea Theodore tied it 2-2 at 8:57 on the power play when he finished off a cross-ice pass from Tomas Hertl.
Benn put the Stars back ahead 3-2 at 16:18 by tipping in a point shot from Duchene.
“I think when you’re playing a top team that’s high in the standings, it makes me more hungry to play against them and try to shut down their top guys,” Dallas forward Logan Stankoven said. “I think the message from our team was to try to play down low and try to put some pressure on their defensemen. I thought we created some good chances tonight from that.”