The Bruins carried much of the play over the final 20 minutes, outshooting the Sabres, 15-3, in the third. Smith struck for the winner with 3:50 remaining in regulation when he ripped home a loose puck from the doorstep after an odd-man rush with Ritchie and David Krejci led to a scramble in front of the Sabres' net.
"I thought we were opportunistic, some of the focus was put on getting to the front of the net and being a little bit more hungry around the net," said Smith. "You could see Ritch bang one in there in the third…those guys just creating a little havoc in front, a lucky puck bouncing out."
Ritchie tied the game earlier in the period on a similar net-front goal that followed a stellar individual effort from Charlie McAvoy, who circled the zone and, in the midst of his second turn around the net, sent a feed toward the crease. The puck bounced around in front before Ritchie whacked it home to knot the game, 2-2, at 5:22 of the third.
"I was coming off the bench, so kind of skating into the play," said McAvoy. "Had some speed and was calling for it from [Jakub Zboril]. He threw it over to me and then I was just trying to use my momentum to just get skating and know that they're a man-on-man team, so just trying to kind of get a step.
"I was actually looking for Smitty through a seam there and we were fortunate enough to get a bounce. But when guys are going to that all game and working hard to get to those dirty areas, it's nice to see them get rewarded."
Boston's first goal was also the result of a strong net-front presence, as Charlie Coyle - for the third time in two games - delivered a monster screen at the top of the crease on a delayed penalty. With the Weymouth native planted in front of Buffalo goalie Linus Ullmark, Matt Grzelcyk fired a wrister from the top of the slot that sailed into the top left corner to tie it, 1-1, with 8:29 to go in the second.
For a club that has struggled to generate offense at times - particularly at even strength - Cassidy was quite pleased with the way the Bruins produced their goals on Saturday afternoon.
"I'm happy they got rewarded," said Cassidy. "When you're trying to preach something or - sell's probably not the right word because every coach in the league probably talks about a net presence - but when it happens for you, then it's a lot easier to back it up now with your own eyes and video that, 'Hey, this is the ways goals are scored.'
"Obviously, we'd like to be a better rush team, we want to get back to being better-functioning or more efficient on the power play. But in the meantime, 5-on-5, you've got to get some traffic.
"Charlie Coyle, again, right in front of the goaltender. And then the other goals, it's just a matter of people getting there and the puck arriving on time."