Despite a valiant effort that including putting the tying run on third late in the seventh top-seeded Chaffee saw the fourth-seeded Blue Jays hold on for a 4-3 upset win.
"This time of year I felt like we had a good recipe coming into the playoffs," Chaffee head coach Brian Horrell said. "Defensively we've been sharp and our pitching has been outstanding all year. We just picked a bad time to have a bad inning there in the sixth."
Locked in a scoreless battle through five innings Jefferson took advantage of a leadoff walk in the top of the sixth to launch what became a game-winning four-run rally.
Following the walk, Deiyden Rushing and Blake Arch strung together back-to-back hits to plate the first run of the game.
Still with no outs, Dylan Newcomer laid down a bunt trying to advance runner from first and third. Though it was fielded cleanly, Newcomer's bunt became a pivotal play in the game when Chaffee threw to third trying to get the lead runner out.
Instead of an crucial first out, however, the Red Devils saw ann errant throw to third sail into left field allowing a pair of runs to score.
"I thought we made the right play," Horrell said of the bunt. "We were trying to be aggressive at that time. We had no runs on the board and they had one. We had the bunt coverage to go for the lead runner at third.
"I thought we got everything we wanted with a hard-bunted ball right at us and a good throw gets him by a mile so it was the right play, but unfortunately we just didn't execute."
Moving up 4-0, Jefferson capped the rally on a single by Jared Schneider.
Responding quickly, Chaffee came out in the bottom of the sixth and, following an initial strikeout, put runners on second and third. Trevor Cannon proceeded to knock in the Red Devils first run of the game on ground out to the shortstop.
Looking to close the gap with Alex Davie at the plate, Chaffee tried to score on a passed ball only to see a play at the plate result in the final out of the frame.
With reliever Alex Davie holding the Bluejays in check in the top of the seventh, the Red Devils came to bat one last time needing three runs to save their season.
Davie and Alex Crowe both reached to start the frame before moving to third with no outs. Cody Johnson went on to plate the first run of the inning on a ground out before a sacrifice fly to left field closed the Red Devils gap to 4-3.
Down to their final out Chaffee proceeded to reload the bases with a pair of hits and a walk to give No. 3 hitter Cody Payne, who doubled in his previous at bat, a chance to win the game.
Unfortunately for the Red Devils, Payne hit grounder to a well positioned second baseman to end the game.
"We rallied and got the guy to the plate we wanted," Horrell said. "And not just with a chance to tie it up, but with a chance to win it. If we could have hand-picked one guy we wanted at the plate it would have been Cody Payne.
"So we had everything we wanted and unfortunately he put the ball in play, it just happened to be right at a kid and that's the way it goes."
Pulled just one out shy of a complete game Brock Boeckstiegel earned the win. He allowed all three runs on five hits and a walk while striking out three.
"He's pitched the big games for us this year," Jefferson head coach Ross Koenig said of Boeckstiegel. "He beat Clearwater and Ste. Genevieve so we knew mentally he'd be ready to go and he was. He just kind of wore down there toward the end. Credit to Chaffee. They made adjustments and hit the ball well."
Outhitting Chaffee 8-6, the Blue Jays were led by Boeckstiegel and Arch who had two hits apiece. Tristen Walsh added a double to Jefferson's cause with Jared Schneider, Rushing and Lankford collecting a single each.
On his team finally breaking through in the sixth Koenig said, "We had opportunities earlier in the game. I think we left bases loaded once and I know we left runners on the first, second and I think even the third inning there.
"We were just hoping we could keep getting guys on and eventually somebody would step up and get a big hit. It happened. We strung a couple together there and scored enough runs."
Leading Chaffee's six hit effort was Payne and Crowe with a double each. Jared Walker, Daniel Dooley, Layton Tenkhoff and Devon Yahn added a single each.
The Red Devils finish the year at 22-4 while Jefferson goes on to play defending champion Valle in the title game on Wednesday at 4:15 p.m.
Jefferson 000 004 0 - 4 8 2
Chaffee 000 001 2 - 3 6 2
WP -- Brock Boeckstiegel. LP -- Cody Payne. Multiple hitters: (J) Andrew Boeckstiegel 2-4, Blake Archer 2-4. 2B -- (J) Tristen Walsh; (C) Cody Payne, Alex Crowe.