The Bruins won their sixth in a row at home and for the seventh time in the past eight games. Boston's last regulation loss was Oct. 30 in Calgary.
After falling behind 4-2 with 7:23 remaining in the first period, the Bruins scored five unanswered goals. Savard figured in on four of them, giving him 600 points in his career.
Savard closed the gap to 4-3 before the end of the first period, and Chara scored a pair of power-play goals sandwiched around Kobasew's second of the game as the Bruins took a 6-4 lead.
Kobasew seemed to deflate Buffalo when he scored a bizarre goal from behind the Sabres net. His shot fell off goalie Ryan Miller's back for Boston's first lead.
Buffalo has dropped three straight and four of five. Miller allowed seven goals on 20 shots. Miller has now allowed 11 goals in the past two games.
CANUCKS 6, RANGERS 3
In New York, Alex Burrows scored two of Vancouver's five goals against Henrik Lundqvist, and the Canucks feasted on turnovers.
The highly anticipated duel between Vezina Trophy favorites Lundqvist and Vancouver's Roberto Luongo never materialized as the New York netminder was gone 5:33 into the second period. He allowed five goals on 17 shots, but it was hard to blame Lundqvist for any of them.
Luongo made a season-high 39 saves.
Vancouver's first four goals resulted from Rangers turnovers, and the last was scored while the Canucks were on a two-man advantage.
Kyle Wellwood scored a breakaway 4:16 in and Burrows followed with another -- while the Canucks were short-handed -- to make it 2-0 at 9:38.
The barrage got worse early in the second period. Burrows took advantage of yet another Rangers giveaway and netted his sixth of the season 1:23 in. Ryan Johnson pushed the lead to 4-0 just 58 seconds later. Three Rangers penalties followed, giving the Canucks a pair of lengthy 5-on-3 advantages.