There are 6 scenarios after tonight.
BOS has 50 wins and the 2-way and 3-way tiebreakers (See (A),(B), and (C) below)
MIL has 51 wins with 1 game to play
PHI has 49 wins with 2 games to play
TOR is locked into 5 seed and CHI is locked into the 6 seed after tonight.
# MIL PHI
1 51 49
2 51 50
3 51 51
4 52 49
5 52 50
6 52 51
#1 BOS gets the 2 seed if they win and the 3 seed and CHI if they lose.
#2 BOS gets the 2 seed if they win and the 3 seed and CHI if they lose.
#3 BOS gets the 2 seed if they win and the 4 seed and TOR if they lose
#4 BOS gets the 3 seed and CHI win or lose
#5 BOS gets the 3 seed and CHI win or lose
#6 BOS gets the 3 seed and CHI if they win and the 4 seed and TOR if they lose
(A) BOS has the 2-way tiebreaker vs MIL because of their records against playoff eligible EC teams
(B) BOS has the 2-way tiebreaker vs PHI because of their records against Atlantic division teams
(C) BOS has the 3-way tiebreaker (along with MIL) vs PHI as a division winner because of (B) and then wins the 2-way tiebreaker vs MIL because of (A)