OTTAWA, Ontario — Noah Dobson scored the tiebreaking goal in the second period and the Islanders beat the Senators, 4-2, on Monday night for their ninth win in 11 games.

Oliver Wahlstrom, Jean-Gabriel Pageau and Brock Nelson also scored, and Mathew Barzal had two assists for the Islanders in the opener of a four-game road trip. Semyon Varlamov stopped 36 shots to win for the third time in his last four starts.

“I thought he was terrific,” coach Lane Lambert said of his goalie. “I thought he played an outstanding game. We’ve been getting solid goaltending out of both goalies. [Varlamov] was outstanding tonight.”

Claude Giroux had a goal and an assist, Drake Batherson also scored and Tim Stutzle added two assists for the Senators. Cam Talbot finished with 31 saves as Ottawa fell to 1-7-1 in their last nine games.

With the score tied 1-1 in the second period, Dobson stepped into a clearing attempt by the Senators along the boards inside the blue line and fired a shot that beat Talbot for his fifth with 6:45 left.

Pageau made it 3-1 with a power-play goal at 8:21 of the third as he backhanded the rebound of Dobson’s one-timer from straightaway inside the blue line. It was his second.

“There’s a lot of experience in the locker room, and we stayed pretty composed and we kept playing,” Pageau said. “We didn’t stop. We played in our structure.”

Giroux cut the lead to 3-2 off a behind-the-back pass by Brady Tkachuk with 6:52 remaining. It was his eighth.

With Talbot pulled for an extra skater as Ottawa looked for the equalizer, Nelson scored an empty-netter to seal the victory.

The Islanders took a 1-0 lead on Wahlstrom’s power-play goal midway through the first period.

Ottawa managed to tie it during a brief 5-on-3 advantage at 8:48 of the second as Batherson one-timed a pass from Stutzle for his second goal in 11 games. It was the Senators’ only goal on six power-play chances.