Andersson tied the game 1-1 at 8:17 of the third period with a power-play goal, a one-timer from the top of the slot on a pass from Nazem Kadri that beat Varlamov's blocker.
The goal came after Wolf kicked out his right pad to stop Bo Horvat at the edge of the crease at 4:07, and made a stick save on Maxim Tsyplakov's chance on a partial breakaway at 4:46. Wolf also made consecutive saves on Noah Dobson at 5:10 after Dobson activated down from the point.
"Your objective is to keep as many goals off the board as possible, but the tendency of our group so far this year is the resiliency," Wolf said. "Whether we have a good 40 minutes or 40 minutes we don’t like, we find a way in the last 20 minutes to get something together. It was a great power-play goal there, we were moving the puck around, it was good to see."
Wolf also slid over to stop Kyle Palmieri's one-timer from the left face-off dot at 14:15, and Varlamov made a right-pad save on Mikael Backlund's rebound attempt after he initially kicked out Miromanov's point shot.
"One-goal game," Roy said. "It could go either way, for us or against us. But their goalie made some great saves. I'm thinking about that cross-pass on Palmieri. That was a really good save he made there. I thought both goalies played well. We had our chance to win this game, we just didn't score the goal that would've made the difference is all."
NOTES: Wolf is 6-1-0 with a 1.83 goals-against average and .944 save percentage in seven home starts this season. ... Andersson, who leads the Flames with 12 points (four goals, eight assists), has been in on 25 percent of Calgary's 48 goals this season. ... Islanders defenseman Alexander Romanov had two shots and eight hits in 21:04 of ice time in his return after missing seven straight because of an upper-body injury.