Down by three late in the second, it was Kuraly who gave Boston hope entering the third period, when he whipped home a feed from Matt Grzelcyk as he fell to his knees, bringing the B's within two entering the intermission.
Acciari followed up at 5:56 of the third, cutting the Toronto lead to 4-3. After a strong forecheck by Schaller behind the net, Acciari banked home a bouncing puck from a sharp angle for his first goal of the postseason.
For the series, Kuraly (two goals, two assists), Acciari (goal, assist), and Schaller (two assists) have combined for eight points, second behind the Brad Marchand-Patrice Bergeron-David Pastrnak trio (23 points) for the most among Boston's forward lines.
"They've been on the ice for four goals in the series - two up there in Toronto that [Zdeno Chara] and Adam [McQuaid] scored in Game 3," said Bruins coach Bruce Cassidy. "We don't expect that every night, the finish we hope will be there. They've all scored some goals this year…it's a nice bonus.
"We use them to keep the other team in check and to dictate more pace to the game, good possession, and if you can get the finish, great. They're all penalty killers, so we expect them to contribute there.
"So yes, it's great when they score. They've done it twice now in five game this series, added offense. Both the games they've done it we haven't been able to take advantage, that's the unfortunate part."