On Wednesday, the Bruins took just the series lead that they have been associated with for nearly a year. In holding a 3-0 edge over the Flyers in the Eastern Conference semifinals, the Bruins have the very lead that they blew a season ago when they were eliminated by Philadelphia in seven games. The Bruins are trying to block out the comparisons to last year, but given where they stand, it’s only natural.
“About half the guys weren’t here last year. It’s different,” center David Krejci  said after the team’s 5-1 win. “We have better depth in our lineup, and we showed it in the first round. Hopefully that’s going to help us in the second round, too.”
While the roster itself is different, many of the veterans who were on the squad know that the B’s did learn from last season’s collapse — even ones who weren’t playing.
“We learned last year that the fourth win is the hardest,” Tim Thomas  said. “We are playing one game at a time, one period at a time, and one shift at a time. We are going to try to play it the same way come Friday.”
The B’s can go for the sweep Friday at TD Garden.