BOULDER — The Buffs are back! The Colorado Buffaloes knocked off the Oregon Ducks Tuesday night by a score of 82-78 at Matthew Knight Arena in Eugene. The win helps the Buffaloes to a 13-6 record, including 5-4 in conference play. The Ducks (11-6, 5-3) had won six consecutive games before Tuesday, including road wins over No. 3 UCLA and…