The Blues sent a shock wave through the Australian Super Rugby conference when they beat the Brumbies 16-30 in Canberra putting the men from Canberra's participation in the play offs in serious doubt.
The Brumbies needed one point in the standings from the match to win the Australian Super Rugby Conference but the Blues prevented them from taking anything from the match.
The result opens the door for current Super Rugby champions the Reds as they can overtake the Brumbies and reach the play offs if they beat the Waratahs with a bonus point.
A five point victory for the Reds would book a place in the play offs and win the Queenslanders the Australian Super Rugby conference and knock the Brumbies out of the play offs completely.
The result also means that the Stormers will have a home Semi-final at Newlands as they cannot be overtaken by any other Super Rugby team.
While the Blues played one of their best matches this season the Brumbies can only blame themselves for the loss as they played nervously and seemingly only with the goal of securing a bonus point.
The Brumbies have enjoyed a strong defence this season but when it mattered in this match they slipped off a total of 34 tackles.
Although the Blues were already out of contention for the play offs the Blues started the match with the third-worst tournament record but moved up one place into 12th place in the standings provisionally.
The Blues dominated the Brumbies from the outset in often slippery and rainy conditions in Australia's capital which now means Brumbies will have to wait for the results of other final-round matches to see if they qualify for the six-team playoffs.
The first half was almost all Blues, with the visitors taking the lead in the 11th minute on lock Liaki Moli's try.
Playing with the kind of drive and flair that was missing for much of their season, the Blues then made it 14-0 when Daniel Braid raced down the wing and scored but the Brumbies did not threaten again.
Trailing 21-13 at halftime, the Brumbies still had a good chance to secure a win or at least get within the seven-point buffer, but allowed the Blues to put the result out of doubt with a series of penalties.
The Brumbies could only add three points through a Jessie Mogg penalty in the second half while the Blues added nine through Piri Weepu and Michael Hobbs' boot.
If the Brumbies make it through to the playoffs, they will have several injuries to contend with, as Dan Palmer and Joe Tomane both suffered injuries in the first half.
The defeat was only the Brumbies' third loss at home this year and their sixth overall.
Final Score Brumbies 16 (13) Blues 30 (21).
Tries - H. Speight
Pen - Z. Holmes 2, J. Mogg
Con - Z. Holmes
Tries - L. Moli, D. Braid, H. Parkes
Pen - P. Weepu 2, M. Hobbs
Con - P. Weepu 3
Referee: Jonathon White
Assistant Ref 1: Ian Smith
Assistant Ref 2: Julian Pritchard
TMO: Matt Goddard
1. Ruaidhri Murphy 2. Stephen Moore, 3. Dan Palmer, 4. Scott Fardy, 5. Sam Carter, 6. Peter Kimlin, 7. Michael Hooper, 8. Ben Mowen (c), 9. Nic White, 10. Zack Holmes, 11. Joe Tomane, 12. Pat McCabe, 13. Andrew Smith, 14. Henry Speight, 15. Jesse Mogg.
Replacements: 16. Anthony Hegarty, 17.Scott Sio , 18. Leon Power, 19. Fotu Auelua, 20. Ian Prior, 21. Tevita Kuridrani, 22. Robbie Coleman.
1. Tony Woodcock, 2. Keven Mealamu (c), 3. Charlie Faumuina, 4. Liaki Moli, 5. Steven Luatua, 6. Chris Lowrey, 7. Daniel Braid, 8. Luke Braid, 9. Piri Weepu, 10. Michael Hobbs, 11. Hadleigh Parkes, 12. Ma'a Nonu, 13. Francis Saili, 14. Lachie Munro, 15. Charles Piutau.
Replacements: 16. Tom McCartney, 17. Tevita Mailau, 18. Andrew Van der Heijden, 19. Peter Saili, 20. Alby Mathewson, 21. Orene Ai'i, 22. Sherwin Stowers.