Brighton ended Burnside's year-long unbeaten streak in the Premier Men's competition while Old Collegians have one foot in yet another finals series after Round 13 of RUSA action.
After falling in their earlier Anzac Cup clash 25-22, Brighton had everything to prove against Burnside did just that with a 29-10 bonus point win on home soil.
Pita Nakarawa, Jacob France, Riley Byrne and Nathan Satala all crossed the chalk but it was the Tigers' defence that impressed most, holding out the Double Blues for 78 minutes before Max Hodell's late consolation try.
In other Premier Grade results, Old Colls romped to a 47-0 win over Adelaide University with Tristan Coetzer (three tries) a standout at Wait Oval.
The seven-try rout left Uni's finals hopes on life support and lifted Old Colls (third) five points clear of Southern Suburbs (fourth).
Barossa's top-four quest was nearly derailed by a brave Woodville at Tanunda but Rams' flyhalf Joe Crouch had other ideas, kicking his side to victory in a 24-20 thriller.
In the women's competition, Burnside and Uni enjoyed bonus-point wins over Onkas and Port Collegians respectively while Brighton remain unbeaten atop the Reserve and Third Grade ladders.
