Dragons penaltypublished at 15:44 Greenwich Mean Time 26 December 2014
Image source, Owen RawlingsAndrew Coombs is hurt as the game carries on around him. Then the Dragons win a penalty on the Blues' 22. Could this be the key moment of the match?
Summary
Dragons win for only the second time in Cardiff since the inception of the regions in 2003
Dragons' Elliott Dee scores their first try, with a second penalty try for the visitors
Cardiff Blues have two tries from Tavis Knoyle and Jarrad Hoeata
Dragons full-back Tom Prydie kicks three penalties
The two sides meet again on 1 January at Rodney Parade
Dragons penaltypublished at 15:44 Greenwich Mean Time 26 December 2014
Image source, Owen RawlingsBlues on toppublished at 15:42 Greenwich Mean Time 26 December 2014
The Blues' bench has changed the complexion of the match completely. They are in control now with the Dragons hanging on.
Converted try for Blues - Blues 17-20 Dragonspublished at 15:40 Greenwich Mean Time 26 December 2014
Image source, Owen RawlingsTavis Knoyle dives over after Gareth Anscombe makes a break. The fly-half adds the extra points and now it's really all to play for.
Blues attackpublished at 15:40 Greenwich Mean Time 26 December 2014
The line out is a mess but the Blues keep on the pressure with Tavis Knoyle and Josh Turnbull to the fore.
Penalty for Bluespublished at 15:38 Greenwich Mean Time 26 December 2014
Image source, Owen RawlingsGareth Anscombe steps up after Phil Price is penalised for a high tackle on Josh Navidi. With 13 minutes to go this is a big call for the Blues. Go for goal or kick to touch? They kick to touch to set up an attacking lineout.
Postpublished at 15:35 Greenwich Mean Time 26 December 2014
Martyn Williams
Former Wales captain on Scrum V"The only concern for the Dragons fans now is they seem to have stopped playing. There's no need for them to be trying long-range drop-goals."
All to play forpublished at 15:34 Greenwich Mean Time 26 December 2014
There's 14 minutes to go. Can the Blues pull this out of the bag now. Macauley Cook comes on for Lou Reed in the Blues' second row.
Drop-goal misspublished at 15:33 Greenwich Mean Time 26 December 2014
A Jason Tovey drop goal attempt from long range is nowhere near the mark. It's a bit more frantic from the Dragons now.
Converted Blues Try (Hoeata) Blues 10-20 Dragonspublished at 15:30 Greenwich Mean Time 26 December 2014
Image source, Owen RawlingsGareth Anscombe and Tavis Knoyle probe well to set up a Blues attack and Jarrad Hoeata dives over from close range to make life interesting. Gareth Anscombe converts. Game on now.
What you're telling us from around the worldpublished at 15:28 Greenwich Mean Time 26 December 2014
A clutch of emails from around the world this Boxing Day:
"Watching the updates from sunny Orlando, from the Withers family."
From Paul Prosser: "I'm a Dragonian in Damman, Saudi Arabia - following on my new ZX81."
And Stephen Lapham says: "Watching from the Falkland Islands whilst making the turkey balti.. c'mon the Dragons!!"
The weather must be better for you than it is in a damp Cardiff
Evans exitspublished at 15:28 Greenwich Mean Time 26 December 2014
Lewis Evans departs as well after a superb hour's work. The number eight has been a huge influence in a dominant Dragons pack.
Dragons replacementpublished at 15:26 Greenwich Mean Time 26 December 2014
Image source, Huw Evans picture agencyImage caption, Tyler Morgan of Dragons
Tyler Morgan's day is over, with Rhys Jones coming on at full-back with Tom Prydie moving into the centre.
Close callpublished at 15:25 Greenwich Mean Time 26 December 2014
Blues attack from an attacking lineout. If it's good enough for the Dragons then why not? Then Gavin Evans spills a miracle ball by Joaquim Tuculet five metres from the Blues' try line.
Postpublished at 15:24 Greenwich Mean Time 26 December 2014
Wales assistant coach Rob Howley
Former Wales scrum-half Rob Howley on Dragons' first try-scorer, Elliott Dee.
"Their driving lineout is going well and the hooker plays an important part.
Image source, Huw Evans picture agency"The foundation of Welsh rugby is based on young talent."
Replacementpublished at 15:23 Greenwich Mean Time 26 December 2014
Tavis Knoyle on in place of Lewis Jones for the Blues at scrum-half.
Moody Bluespublished at 15:22 Greenwich Mean Time 26 December 2014
The gloom is descending on the Arms Park and is matched by the subdued home crowd who are being out-shouted by the Dragons' fans.
Driving the waypublished at 15:20 Greenwich Mean Time 26 December 2014
The Blues have to do something quickly. The Dragons' driving maul is proving a hugely effective weapon. It's difficult to see how the Dragons can be denied their second ever win at the Arms Park if this carries on.
Get involvedpublished at 15:18 Greenwich Mean Time 26 December 2014
Mark Welland has emailed us from across the border: "I'm having to watch it on my smartphone as we are spending Xmas with family in England."
Where is everyone else watching from? Turkey sandwich in hand?
Handbagspublished at 15:17 Greenwich Mean Time 26 December 2014
Gavin Evans is penalised after lashing out at opposite number Jack Dixon. Dragons take the opportunity to relieve some rare Blues pressure.
Postpublished at 15:14 Greenwich Mean Time 26 December 2014
Jonathan Davies
Former Wales fly-half on Scrum VThat is a big, big try. Psychologically for the forwards as well.
The Blues forwards are in disarray. They have no idea how to stop this, they're all over the shop.
Image source, Huw Evans picture agencyThat's a very, very good call as well from referee Leighton Hodges.