Newport Gwent Dragons claimed just their second away win over Cardiff since the inception of regional rugby at a packed Arms Park.
Two tries from line-out drives brought them their fourth victory on the trot in all competitions, although a final quarter rally did earn the hosts a losing bonus point after a 23-17 defeat. In the end, it was the place kicking of 13-point Dragons full-back Tom Prydie that proved the difference between the sides in a rip-roaring derby.
After a physical opening in driving rain, it was Newport who put the first points on the board with Prydie landing a penalty from halfway.
It was obvious the Dragons had not come just to make up the numbers and their ambition was rewarded on the half hour. Kicking a penalty to the corner, they secured possession through skipper Rynard Landman and then executed a well-worked line-out drive which motored over the whitewash with the impressive Dee touching down.
Prydie landed the conversion from wide out and a further penalty to stretch the visitors’ lead ahead of Davies finding his range with the last kick of the half to make it 13-3 at the break.
Not long after the restart the hosts found themselves in even more trouble as the Dragons secured a second try from a driving line-out. This one went all the way from the 22, with the backs joining in as it neared the line, and Dee was once again the man to touch down. But referee Leighton Hodges had already signalled a penalty try against the Blues for pulling down, with Prydie adding the conversion.
As the game moved into the final quarter, the hosts managed to find some continuity, stringing together 14 phases that culminated in Kiwi lock Jarrad Hoeata driving over.
Then 10 minutes from time replacement scrum-half Tavis Knoyle stretched over for a second converted try following an Anscombe break to cut the deficit to three points.
But a fifth successful kick from Prydie sealed the historic win for the Dragons.
Cardiff Blues scorers: Tries: Hoeata, Knoyle. Cons: Anscombe 2. Pens: G. Davies.
CARDIFF BLUES: Tuculet, Cuthbert, Allen, G. Evans, Gonzalez-Amorosino, G. Davies, L. Jones, Hobbs, Rees, A. Jones, Hoeata, Reed, Turnbull, E. Jenkins, Navidi.
Replacements: Filise for G. Davies (47), Knoyle for L. Jones (58), G. Jenkins for Hobbs (53), Dacey for Rees (53), Anscombe for A. Jones (47), Cook for Reed (66), Vosawai for E. Jenkins (58).
Gwent D’gons scorers: Tries: Dee, Penalty. Cons: Prydie 2. Pens: Prydie 3.
NEWPORT GWENT D’GONS: Prydie, Pewther, Morgan, Dixon, Amos, Tovey, J. Evans, Price, Dee, Harris, Coombs, R. Landman, J. Thomas, Cudd, L. Evans.
Replacements: R. Jones for Morgan (61), Rees for Tovey (69), D. Jones for J. Evans (69), Gough for Coombs (76), Hill for L. Evans (62).
Ref: Leighton Hodges (Wales).