Craig Smith gave Dallas a 1-0 lead at 11:35 of the first period when Steel's turnaround shot from inside the blue line deflected in off him.
Suter made it 2-0 at 17:16 with a shot from the high slot that deflected off the stick of Kurashev.
Seguin extended the lead to 3-0 at 19:11 of the first, tapping in a backdoor pass from Marchment.
“8-1 is tricky. In this league, you’re not going to see that all the time," Seguin said. "This is a sport where you try to chase that full 60 minutes, and it’s hard to do. It’s a great league. Our main focus was getting off to a better start and not chasing the game. We did that to a T tonight.”
Chicago was outshot 17-6 in the first period.
“My only hope for a game like today is we just finally hammer it through our thick heads of how we're going to need to play, and that is not it,” Blackhawks forward Nick Foligno said. “That is just not who we are, not who we can be. That's not what we expect in the room. That's not what our fans should expect.”
Steel made it 4-0 at 3:43 of the second period, roofing a backhand from the right circle shortly after a power play expired.
Marchment pushed it to 5-0 at 12:50 with a power-play goal from the low slot.
“That’s the story of our team is our ability to score and to get scoring from multiple lines,” Dallas coach Peter DeBoer said. “The game was really set by that fourth line (Smith-Ty Dellandrea-Steel). If we’re going to have any kind of success come playoff time, we’re going to need different contributions from different lines almost every night. It’s nice to get that. We had some guys in some ruts for a little bit of a stretch here recently, and everyone seems to be coming out of it.”
Kurashev scored on the power play 39 seconds into the third period to make it 5-1. He finished off a tic-tac-toe passing play with Connor Bedard and Cole Guttman into an open net.
Roope Hintz responded for Dallas to make it 6-1 at 4:46 when he batted in a rebound.
“It’s tough to explain. It seemed like every mistake was going in tonight, and couldn’t stop the bleeding,” Blackhawks forward Anthony Beauvillier said. “Losing games is one thing, but I feel like we need to be connected and keep working. It’s a bad feeling losing a game like that. Sometimes you lose like we did last game, but the energy was really good. Played a really good game and there was a lot of positives coming out of last game. Tonight, it’s hard to find some positives.”
NOTE: Blackhawks forward Tyler Johnson left at 3:43 of the second period with an undisclosed injury. Richardson said after the game that he’ll be out “a little bit” but will need further testing before a timetable can be established.