BOSTON — Two-goal leads are usually more secure in the Bruins’ possession.

But Boston fell to 31-0-3 in games it has held a two-goal lead by dropping one in overtime tonight.

Former Bruins forward Brad Boyes scored the game-winner on a tap-in after an end-to-end rush by Nathan Gerbe to clinch a 4-3 Buffalo win at TD Garden.

Boyes, Thomas Vanek and Tyler Ennis all had two-point nights for the Sabres.

Here’s a look at the rest of the box score:

•It was a tough night for Tim Thomas, who finished with 41 saves. He gave up a terrible rebound on Gerbe’s shot on the rush and then was out of the net when Gerbe slid the puck over to Boyes.

•Nathan Horton, Mark Recchi and Gregory Campbell scored the Bruins’ goals. Horton now has at least a point in six of his last seven games. Recchi and Campbell both broke eight-game goal droughts.

•Zdeno Chara’s first game since his game misconduct in Montreal went swell with two assists and a plus-2 rating in 25:54 of ice time.