What's at stake tonight in Game 4? According to whowins.com, historically in NHL best-of-seven series, the difference between the higher seed being up 3-1 or tied 2-2 is 28.2%.
In other words, higher seeds that were up 3-1 have had a 90.2% record in series (194-21) while higher seeds that were tied 2-2 have had a 62.0$ record (119-73).