The ACT Brumbies capitalised with two tries when Chiefs replacement winger James Lowe was sinbinned in the second half to post a 41-23 victory in their Super Rugby clash in Canberra on Friday night.
Lowe was given a yellow card for foot-tripping Brumbies winger Joe Tomane and the home side responded with two tries to centre Tevita Kuridrani and a penalty and conversion to half-back Nic White to blow their lead out to 33-9.
Tomane and first five eight Matt Toomua scored earlier tries for the home side.
The Chiefs had been in the game at 13-9 down shortly after halftime when Gareth Anscombe slotted his third penalty before the yellow card and saved face with late tries to replacement halfback Brad Weber and prop Josh Hohneck.
But Toomua's second try after the final hooter rubbed salt into their wound.
The Brumbies not only avenged their loss in the final last year but also extended their lead in the Australian conference.