For the second straight game, the Islanders let a third period lead slip away.
Bo Horvat's goal - his third in the last three games - late in the second period had the Islanders up 2-1 heading into the third period, while Matt Martin's deflection later had the Islanders up 3-2.
CANADIENS 4, ISLANDERS 3 OT
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In both instances, the Islanders were not able to hold off the Canadiens, who have played the Islanders much tougher than their last-place standing in the Atlantic Division would indicate. Montreal was credited with 12 high-danger chances for at five-on-five, compared to seven for the Islanders on the night. Montreal won the high-danger chance battle 4-1 in the third period.
"In the third period, we came out a little flat and didn't have enough push last game," Horvat said. "Tonight, I thought we still had our chances and still came strong, but we just couldn't get it done."
Justin Barron initially made it 2-2, coming in as a trailer and snapping his first of the season past Semyon Varlamov at 4:02 of the third. Martin's tip on an Alex Romanov shot - as the defenseman made his return to Montreal for the first time since being dealt by the Habs - made it 3-2, but Montreal didn't quit. Kirby Dach deflected a Mike Matheson point shot past Varlamov at 16:44 to send the game to overtime.
In OT, the Islanders had their shot, as Sebastian Aho drew a penalty that sent the Isles to a 4-on-3 power play, which felt extended due to the Isles possession on a delayed penalty. The suddenly rejuvenated power play - which had a goal in the game and four over the past four - peppered the Canadiens, but could not break through.
As Mike Hoffman left the penalty box, a Mathew Barzal turnover led to a breakaway for the Canadiens forward. While Hoffman was initially denied by Varlamov, Matheson was there to clean up the rebound. The play underwent a lengthy offside review, but ultimately stood.
"It's extremely deflating twice," Lambert said of the initial goal and then the lengthy review not going the Isles way.
Per team statistician Eric Hornick, the Islanders third period differential is now -1; the Isles were +16 in the third period through 23 games but are -17 over the last 33 games.