Sylvain Turgeon scored at 2:36 of overtime to give the Hartford Whalers a 3-2 upset victory over the Nordiques in the first game of their NHL playoff series last night in Quebec.

Turgeon dug the puck off the boards to the left of goaltender Clint Malarchuk, moved in front and fired a low shot into the short-side corner to give the fourth-place Whalers a victory over the Adams Division champions in the opener of this best-of-five series.

Brent Ashton had sent the first-round Adams Division series into overtime when he tied the game for Quebec at 12:47 of the third period. Ashton took a a drop pass from Peter Stastny at the edge of the faceoff circle and drilled a slap shot past Mike Liut on the stick side.

The Whalers took the lead when former Nordique John Anderson scored a power-play goal midway through the third period. Anderson, who came to Hartford on March 8 for defenseman Risto Siltanen, scored when he deflected in a low shot from the point.

*Canadiens 3, Bruins 1: In Montreal, rookie Patrick Roy made 25 saves and Bobby Smith scored twice in the second period to help the Canadiens post a victory over Boston in the opening game of their Adams Division series.

The Canadiens led, 3-0, when Gord Kluak broke Roy's shutout bid with a power-play goal at 14:46 of the final period.

Montreal opened scoring when its slumping power-play unit finally cashed in on the fourth of four straight chances when Smith scored at 6:53 of the second period.

Defenseman Gaston Gingras fed a pass to the slot, where Smith slapped a drive into the corner of the net past goalie Pat Riggin.

Smith put Montreal up by 2-0 at 11:28, picking up a rebound and backhanding the puck past Riggin.

Mike McPhee deflected a drive by Larry Robinson into the net at 16:30 to make the score 3-0.

Referee Bryan Lewis called 23 penalties in the first two periods.

*Maple Leafs 5, Blackhawks 3: In Chicago, Steve Thomas scored two goals and Gary Leeman and Walt Poddubny scored key third-period goals to rally Toronto in the opening game of a Norris Division semifinal series.

Leeman, who assisted on two other goals, broke a 2-2 tie at 6:09 of the third period and Poddubny scored at 9:28. Thomas, who scored the game's first goal, got a power-play goal before Tom Lysiak added a consolation goal at 18:29.

*Blues 2, North Stars 1: Doug Gilmour's short-handed breakaway goal with 12:54 left lifted St. Louis to victory over Minnesota in Bloomington, Minn., in the first game of their Norris Division series. Rick Wamsley made 27 saves as the Blues beat the team that swept them out of last year's Stanley Cup playoffs.

With the score 1-1 and Bernie Federko in the penalty box for tripping, a drop pass by Minnesota's Scott Bjugstad intended for Kent Nilsson was intercepted at the Minnesota blueline by Rick Meagher. Meagher fed Gilmour at mid-ice and the third-year center skated straight at Don Beaupre before pushing the puck through the retreating goalie's pads.

Minnesota managed only three shots in the scoreless first period.

*Oilers 7, Canucks 3: In Edmonton, Mike Krushelnyski and Kevin Lowe scored 42 seconds apart early in the third period to help the Oilers begin their quest for a third consecutive Stanley Cup with a triumph over Vancouver.

Krushelnyski deflected Paul Coffey's point drive on the power play at 4:27 of the third to give the Oilers a 4-2 lead. Lowe snapped in Mark Napier's cross-ice pass into an open side at 5:09.

Patrik Sundstrom cut the lead to 5-3 for Vancouver after picking up a rebound off the back boards on the power play at 7:47. Krushelnyski, however, restored Edmonton's three-goal lead at 10:49.

*Flames 5, Jets 1: In Calgary, Alberta, rookie Mike Vernon made 22 saves in his first playoff appearance and Jim Peplinski had a goal and an assist to lift the Flames over Winnipeg in the opener of the best-of-five Smythe Division semifinal series.

Vernon was not tested in the first two periods as he faced only 10 shots but came up with 13 saves in the scoreless final period when the Jets outplayed the Flames and tried desperately to get back into the contest. They were stymied by Vernon, who made key saves off Ray Neufeld early in the period and Perry Turnbull midway through.

Peplinski set up the Flames' third goal and played a solid two-way game for Calgary before putting the game out of reach with the final goal in the second period.