Some of the details of how the Bruins can manufacture wins will change from night to night, and on Monday night in Dallas, they got solid performances from their fourth line and youngsters.

But one thing they’ve needed every night is tremendous goaltending. Jeremy Swayman had that covered for them on Monday. He made 34 saves, many of them of the danger variety, to backstop the B’s to a solid – if white-knuckle – win, 3-2, over a very good Dallas Stars team at American Airlines Center.

As they did in Detroit, the B’s took a 2-0 lead in the first period, this time doing it on the strength of a pair NHL first goals.

The fourth line had an excellent first period and was on the ice for both goals. Johnny Beecher scored the first goal at 10:21. The rookie collected a big rebound out high on the right side and, with no one in front of him, he took it down to the circle and flicked a beauty of a wrist shot over standout goalie Jake Oettinger’s glove.

“I was just trying to snap one off before they got a stick on it and it worked out,” Beecher told NESN after the first period of his first NHL goal.

The rookie crew wasn’t done getting on the scoreboard, as defenseman Mason Lohrei scored his first in just his third NHL game at 14:09. Ian Mitchell played a puck down low behind the Dallas net to Danton Heinen, who protected the puck against Stars’ defenseman Thomas Harley. Heinen spotted Lohrei out high and, with Oskar Steen providing a screen, the young D-man beat Oettinger over the glove as well.

At the other end, Swayman was excellent. He wasn’t busy early but the chances he faced were glittering. He stopped both Harley and old friend Craig Smith on separate prime scoring chances, then he stood tall on a late Dallas power play. The B’s held a 14-11 shot advantage in the first.

Much like Saturday’s game in Detroit, the B’s found themselves defending far too much in the second period, but Swayman stood tall.

After the B’s killed their second penalty of the game, the Stars had several point-blank chances, one from Wyatt Johnston and and two more from Smith, all of which were gobbled up by Swayman.

Dallas surged for much of the second period, but with about six minutes, the B’s regained control of the play, forcing the action in the Stars’ zone and protecting the puck well. The B’s wound up having a 11-10 shot advantage in the second and that helped them to get to the third period with their 2-0 lead intact.

If there was a bugaboo for a team that was 9-1-1, it was the two-goal lead. They squandered one in Detroit on Saturday and lost in regulation. They had lost one to Toronto last week but managed to win it a shootout. They’d also lost a two-goal bulge earlier late in the third period against Anaheim and lost in overtime.

And they couldn’t maintain the two-goal advantage in the third. The Stars finally beat Swayman at 5:09 into the third after a turnover at the offensive blue line when Lohrei could not control a Pavel Zacha pass. Eventually, Johnston tipped home an Esa Lindell shot to make it 2-1.

But the B’s regained the two-goal advantage at 9:51 after David Pastrnak drew a penalty on Mason Marchment in the neutral zone and the B’s immediately made the Stars pay. Off a faceoff win, Pastrnak fired a shot that produced a rebound for Bad Marchand to backhand home from the top of the crease for a 3-1 lead.

The B’s got another power play that nearly blew up in their faces. Swayman had to stop Roope Hintz on a clean shorthanded breakaway and then, seconds later, Johnston hit the post.

But the B’s were able to run the clock down before Joe Pavelski scored on patented tip with Oettinger pulled for the extra skater with 27.6 remaining in regulation. The B’s then had to kill 5.7 seconds left of a penalty after Hampus Lindholm was called for tripping, which they managed to do – barely..