BOSTON — Tyler Bozak and Clarke MacArthur scored and James Reimer stopped 43 shots to help Toronto stay alive in the first-round playoff series.
Game 6 is Sunday in Toronto, with the decisive seventh game back in Boston on Monday, if necessary.
Boston has won both games in Toronto in the series and has not lost on the Leafs’ home ice in the playoffs since 1959.
Zdeno Chara scored for Boston to cut the deficit to it 2-1 with 8:48 left. The Leafs killed off a delay-of-game penalty in the last four minutes and then protected the lead when the Bruins pulled Tuukka Rask for an extra attacker with 1:11 left.
Rask made 31 saves.
Only once in their history have the Leafs come back to win a playoff series after falling behind 3-1: In the 1942 Stanley Cup finals, when Toronto won four straight to take the title after losing the first three games against Detroit. The Bruins are 15-2 in playoff series after taking a 3-1 lead, but they blew a 3-0 lead against Philadelphia in the 2010 Eastern Conference semifinals.