It was a low-percentage chance that might just help the Boston Bruins reach the playoffs for the first time in three seasons. “Ninety-nine out of 100 it’s not going to go in,” Boston’s Drew Stafford said of his dump-in shot that went into the net with 5.6 seconds left after it tipped off Philadelphia defenseman Brandon Manning’s stick, giving the Bruins a 2-1 win over the Flyers on Saturday.