Since the 2006 playoffs, teams that won game 1 by 3 or more goals:
Won game 2: 19/32 times
Won game 2 by >1.5: 7/32 times
So, if you're an odds guy, you're playing Toronto (3% edge) and Islanders (8% edge) money lines and Toronto PL (13% edge) and Islanders PL (20% edge)
If you think it's near impossible either wins, Pittsburgh was in a few of those huge game 1 wins and lose the second.