Assuming that
this thread, that was made one day before game 6 of the Bruins-Leafs series, has the correct numbers up to that date, the Bruins record for the playoffs is as follows:
Bruins record when only Bruins can win series: 4-11
Bruins record when only opposing team can win series: 6-0
Bruins record when both teams can win series (game 7): 5-4
So I assume that losing the first three was Bylsma's plan all along since it's easier to win against them then. Freaking genius.
*EDIT: Hm, the OP of the mentioned thread updated his numbers and they're different. Somebody here can't count and I fear it's me. The point stands, though.