Boston probably is the superior team here. But this is nearly last stand time for the Islanders, down 2-1 in the series and playing at home with Game 5 set for Boston. 

The Islanders showed their resilience and tenacity in taking out the Penguins. During this series, two of the three games have been decided in overtime. 

You know with the Islanders you're going to get a well-disciplined defensive effort and good coaching. New York is 23-9 in its last 32 home games. 
The Bruins also are unlikely to have one of their better defenseman, Brandon Carlo. He suffered a head injury in Game 3.