ASHLAND — Southern Oregon needed every bit of Elijah Jackson’s offensive absurdity to stay afloat in the quarterfinal round of the Cascade Conference Championships. By hitting 11 of his first 12 attempts, he bought just enough time for reinforcements to arrive and the Raiders to turn the tables in an 80-70 win against Eastern Oregon on Tuesday night at Lithia Motors Pavilion.

Jackson, a junior guard from Fallon, Nev., finished with 29 points and converted a four-point play with 12 minutes left that started No. 4-seeded SOU’s 34-14 game-closing push. Brady Rice supplied a much-needed spark off the bench with all of his 10 points and four assists during the final stretch, and Bryce Dyer hauled in 18 rebounds — the most for any Raider in 12 seasons — to go with 11 points and four assists.

The No. 4-seeded Raiders (20-9) hit the 20-win mark for the eighth time in their last 11 full seasons, advancing to play at top-seeded and No. 3-ranked College of Idaho in Friday’s semifinals. They also bolstered their case for an NAIA National Tournament at-large bid and likely ended the season for the No. 5-seeded Mountaineers (18-11).

Jackson finished 12-of-15 from the field with four assists. At one point, going back to Saturday’s 26-point performance against Multnomah, he’d made 19 of the last 20 shots he’d put up. The four-point play, which came at a time when the Raiders trailed 56-46 and were teetering on the brink of elimination, easily presented the highest degree of difficulty of those.

It gave the Raiders a shot of momentum that continued to build on their next possession, when Dyer grabbed one of his seven offensive boards for a tip-in. Following another defensive stop, Rice’s 3-pointer cut the lead to one with 10 minutes left.

SOU finally tied the score, 62-62, on another Rice transition triple with seven minutes remaining. A minute later, the redshirt-freshman went to the basket to put the Raiders in front. Dyer then collected a defensive board on the other end and hit Mason Whittaker for a 3 that made it 67-62.

Dyer’s third tip-in of the night gave the Raiders a 69-64 lead with 4:13 left. They had at least a two-possession edge the rest of the way, icing the win on Jack Chlumak’s transition 3 with under a minute to go.

Dyer’s work — in his 11th double-double of the season and fifth in his last six games — helped them to a critical 21-11 advantage in second-chance points. After allowing the Mountaineers to shoot 53% in the first half, they also held them to 32% in the second.

TJ Doman led four Mountaineers in double figures with 18 points, six rebounds and four assists. He and Garrett Hawkes, the CCC’s leading scorer, came up with just one bucket between them over the final eight minutes.

The Raiders are through to the semifinal round for the seventh consecutive season. They’ve now defeated EOU 14 of the teams’ last 15 matchups in Ashland.