Halifax and Saint John wrapped up a home and home two-game set on Sunday when the Mooseheads defeated the Sea Dogs 3-2 in Quebec Major Junior Hockey action.
Matthew Boudreau led Halifax (20-9-3) with two goals and an assist while Martin Frk scored the other.
Tomas Jurco and Danick Gauthier replied for Saint John (26-10-1).
Zachary Fucale made 24 saves for the win while Sebastien Auger stopped 16 shots in defeat.
The Mooseheads scored twice on seven opportunities with the man advantage as Saint John went 0-for-4.
The two Maritimes Division rivals split the weekend set as the Sea Dogs won on Saturday night 7-3.
Overall, Saint John leads the season series three games to one.
Elsewhere in the QMJHL, it was: Quebec 6, Val-d'Or 4; Chicoutimi 7, Moncton 1; Gatineau 3, Rouyn-Noranda 2; and Shawinigan 5, Rimouski 0.
At Halifax, N.S., Boudreau opened the scoring late in the first period to give the Mooseheads a 1-0 lead.
Boudreau then added his second goal of the game at 5:57 of the second period, on the power play, to double Halifax's lead, but Jurco scored at 18:15 to make it 2-1 Mooseheads after 40 minutes of play.
Frk made it 3-1 with another power-play goal midway through the third period.
Gauthier got one back for Saint John with 56 seconds left in the game but it was too late as Halifax won 3-2.
Remparts 6 Foreurs 4
At Quebec City, Mikhail Grigorenko had a goal and set up two others as the Remparts (25-6-3) defeated Val-d'Or (15-17-4).
Sagueneens 7 Wildcats 1
At Saguenay, Que., Lukas Sedlak scored three times as seven players in all registered multi-point games, leading Chicoutimi (15-10-8) over Moncton (17-16-2).
Olympiques 3 Huskies 2
At Gatineau, Que., Emile Poirier scored the winning goal in the third period while Francois Lacerte turned away 26 shots as the Olympiques (16-13-5) edged Rouyn-Noranda (12-23-2).
Cataractes 5 Oceanic 0
At Rimouski, Que., Yannick Veilleux and Michael Chaput each had a goal and an assist while Gabriel Girard stopped all 27 shots he faced as Shawinigan (22-9-4) shutout the Oceanic (20-17-0).