Yes, Varly has been great against the Bruins this season.
In 10 games:
7-1-1 (we know where that OT loss came from)
322 out of 341 (.944 save percentage)
Allowed 2 goals or less in 7 of the 10 games (allowed ONLY 3 in each of the three remaining games) and that is with 4 of the games going into OT
106 of 112 in this series (.946 save percentage)
And just another reason to stay out of the box:
6 of the 19 goals he has given up against the Bruins (including 2 of the 6 in this series) has come on the PP.