In the season to date, Boston had given up eight third-period goals.
The Canadiens got two.
Goals by Max Pacioretty and David Desharnais erased a 3-2 deficit and gave the Canadiens a hard-earned win over their arch-rivals.
Peter Budaj made 31 saves … including a brilliant stop on Tyler Seguin in the dying seconds.
The Canadiens move past the Bruins into first place in the Northeast Division and the Eastern Conference.
The Canadiens have a new top line: Desharnais, who scored twice; Pacioretty, with a goal and an assist, and the dynamic rookie Brendan Gallagher, who had two assists.
The Canadiens have taken at least a point in 11 straight games.
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