Mike Bossy's power-play goal at 11:14 of the third period last night in Uniondale, N.Y., helped the New York Islanders to a 6-3 victory over the Pittsburgh Penguins and made Bossy the first National Hockey League player to score at least 60 goals in three consecutive seasons.

The Islanders trailed, 3-2, entering the final period and had failed on a 10-minute power play before their specialty teams turned the game around. Butch Goring and Billy Carroll connected on short-handed efforts and Bossy got his power-play goal.

Goring tied it with his short-handed goal at 7:31, a rebound of Tomas Jonsson's slap shot. And Bossy, who joined Phil Esposito as the only NHL player with at least 60 goals in four different seasons, broke a 3-3 tie with a short wrist shot past Pittsburgh goalie Michel Dion. It was Bossy's 19th power-play goal of the year.

Then, 3 1/2 minutes later, Carroll--a defensive forward who had been blanked in 69 previous games this season--put a 20-footer between Dion's pads on a setup from Goring. Greg Gilbert added an empty-net goal with 10 seconds remaining.

Two-thirds of the way through the second period, Pittsburgh's Gary Rissling was assessed a 10-minute match penalty for head-butting Dave Langevin. But the Islanders failed to convert on their 10-minute power play, wasting two minutes when Jonsson was penalized.