Nashoba’s Chieftains, coached by Ken Tucker, own the state’s longest winning streak after their 20-6 Division 2 win over Shepherd Hill Regional at Gillette Stadium.

And Blackstone Valley avenged its Week 9 loss to Bay Path Regional Tech with a 6-0 victory in the Division 6 championship game at Fitchburg State University.

Here’s a look at their roads to the championship games:

Central Mass., Division 2

Nashoba Regional 20,

Shepherd Hill Regional 6

Season’s defining moment: Over the course of the Chieftains’ perfect 13-0 season, their average margin of victory was 26.5 points, but not all of their wins were sure things. In weeks 4 and 5, Tucker’s team found out it wasn’t where it wanted to be, with close calls against Marlborough (a 28-14 win) and Clinton High (a 7-0 squeaker).

“We didn’t need to lose to learn a lesson,” Tucker said. “We knew we had to get back to work, and we told them very clearly we were getting back to basics. In practice we always try to get a lot of repetition, and they can go by very quickly with our no-huddle’’ offense.

“What we found was that we were sometimes favoring quantity instead of quality. We decided we’re gonna stop, go over things, repeat plays, do things we weren’t doing in practice. We had to pay more attention, we had to pay more attention as coaches, we had to focus on attention to detail,’’ he said. “We had gotten away from that a little bit, but we got back on the straight and narrow.”

The second straight perfect season and back-to-back Super Bowl titles for Nashoba, which draws students from Bolton, Lancaster and Stow, extended the team’s state-best winning streak to 26 games.

Key play of Super Bowl: The 22-yard interception return for a touchdown by senior cornerback Brady Schartner late in the fourth quarter sealed what had been a one-possession lead.

“It’s exactly what you teach” when coaching the defensive secondary, Tucker said of Schartner’s play. “Break on the ball, keep everything in front of you so you can react to it. His reaction was phenomenal. . . . When I saw him come back and break on the ball I knew it was going to be six.”

Unsung hero: Hard to say the quarterback of an undefeated team went unnoticed, but in a lot of ways that was the case for senior Jack Sarnoski . The rushing attack’s gaudy numbers overshadowed Sarnoski’s ability to make big throws, especially late in the season. And on defense, the 6-foot-1, 220-pounder was a top inside linebacker on a defense that allowed just 7.2 points per game.

“His leadership cannot be underestimated,” Tucker said of the cocaptain. “He was a quiet leader who demanded the best from everybody. A two-way player who would make the tough play when we needed it. He always wanted the ball in his hands.”

Statistics check: Still coping with an ankle injury suffered in a Week 8 win over Doherty Memorial, senior running back John Ojukwu  wasn’t at full strength at Gillette Stadium, but he still finished the year with mind-boggling numbers. He gained more than 1,100 yards rushing on fewer than 100 carries, and scored 120 points despite missing two regular-season games to the injury.

Coach’s corner: “This senior class has been special since they got to Nashoba,’’ Tucker said. “We knew, and I think they knew, that they were gonna be a great football team. But they worked hard every single day from freshman year on. In the last two years they’ve been a dream in particular.”

The future: The Chieftains will lose 19 seniors to graduation, but Tucker feels the program is in good position for next year, given the experience that many of the younger players gained this season.

“We never underestimate the value of getting kids on the field no matter what the circumstances are,” he said. “When the game is in hand, we get other kids in, and we’ve seen great development from some of those players.’’

Central Mass., Division 6

Blackstone Valley Tech 6,

Bay Path Regional Tech 0

Season’s defining moment: After a 49-8 win over Keefe Tech in Week 5, coach Jim Archibald  asked his team to show up on the Monday morning of the Columbus Day weekend for a film session.