The Bruins-Canadiens rivalry had been dormant for several years, but it should felt like it was back in full force on Saturday night at the Bell Centre.

The B’s gave up a power-play goal on a questionable call and had a goal taken off the board. After an eventful third period, Montreal’s Kaiden Guhle scored in overtime to snap their 10-game losing streak to the Bruins with a 3-2 victory. Jeremy Swayman suffered his first loss of the season, albeit not one in regulation.

The B’s took a 1-0 lead into the third, but that turned into a one-goal deficit just 51 seconds into the period.

Montreal started the period with 33 seconds of power play time and they cashed in 24 seconds into it with Nick Suzuki beating Swayman through a screen to tie the game.

Then on the next shift, Brendan Gallagher followed up his own deflection to beat Swayman in tight to give the Habs a 2-1 lead.

It appeared the B’s had tied it at 2:05 when Oskar Steen deflected home an Ian Mitchell shot. But Monreal coach Martin St. Louis challenged for goalie interference. And though Steen’s contact with netminder Sam Montembeault was minimal at best, the goal was taken off the board.

The B’s did not like turn of events and, when Brad Marchand felt a hooking penalty should have been called, he got sent off for abuse of the officials.

But the refs gave the B’s their chances, too.

On the penalty kill, the Habs were called for simultaneous penalties on a Boston rush, which would give the B’s a 5-on-3 for 1:31. They came up empty.

The B’s finally tied it up with 7:02 left in regulation on another power play. This time they made quick work of it. Off the initial faceoff, David Pastrnak banked a pass off Marchand’s skate for the equalizer. The officials reviewed that one, too, but it was ruled there was no distinct kicking motion and the goal was upheld.

But the Habs came up with the winner in OT.

Charlie McAvoy was playing his first gamer back since serving a four-game suspension and he didn’t waste any time getting on the scoresheet.

On the first shift of the game, rookie Mason Lohrei cut down from the left point and tried to feed Marchand on the right side. Marchand could not handle the pass on his backhand, but the captain chased it down in the corner and fed McAvoy at the blue line. With Pavel Zacha battling with a Montreal defender in the slot, McAvoy fired a shot that Zacha deflected past Montembeault for his fifth of the season just 36 seconds into the game.

They took that 1-0 lead into the first intermission, but the Habs had their chances off the rush in the first period. The best chance came on a 2-on-1 for Sean Monahan and Gallagher. Derek Forbort took away the pass, so Monahan floated down to take a high danger shot from low in the left circle. Swayman made the stop and Gallagher could not put home the rebound. Monahan would later hit a post, as would Jake DeBrusk at the other end.

The one-goal lead held up through two periods as well, despite both teams getting power play chances.

The B’s got the first one when Pastrnak drew a holding call on Johnathan Kovacevic, who thwarted an excellent chance by taking the infraction. On the advantage, the B’s had multiple chances and kept the puck in the Montreal zone for the almost the entire two minutes but could not get another one past Montembeault. The best chance was a Marchand one-timer that was fanned on.

The Habs got their opportunities later in the period when the B’s were whistled for three consecutive penalties, two of which (a Brandon Carlo holding call and then a Zacha tripping penalty) produced a 26-second 5-on-3 that Montreal could not cash in on.

Then with 1:27 left in the period, Montreal benefited from a high-sticking call on Pastrnak, who clipped Kaiden Guhle on the back swing of a follow-through. Usually a high-stick off a follow-through is allowed, but not this time.

The B’s killed the first part off but had a half minute to go to start the third period. That’s when things went awry.