George Earle is introduced, with Josh Turnbull coming off the pitch
Nice nudge by Anscombe to find touch in the Ospreys 22
Rey makes a break, and looks to have put Tomos Williams through, but Dan Evans knocks the ball out in the air. Just a penalty, and a yellow card, however, and Anscombe's effort is wide 23-23
Gareth Anscombe adds another penalty to take his tally to 18 for the afternoon. 23-23
Willis Halaholo is replaced by Garyn Smith
Seb Davies is replaced by Shane Lewis-Hughes
Kirby Myhill replaces Ethan Lewis
Dillon Lewis and Rhys Gill are replaced by Dmitri Arhip and Rhys Carré
Try disallowed for Tomos Williams as Nick Williams is penalised for a block in midfield
That try was Josh Turnbull's third in four games for the region.
Anscombe brings us back within three with the conversion. 20-23
It's a perfect response as Josh Turnbull capitalises on a poor tidy-up from Aled Davies to crash over. 18-23
Cory Allen sent to the sin bin for a deliberate knock on.
Tomos Williams replaces Lloyd Williams
Sam Davies adds the extras to open up a 10-point gap
Nicky Smith crashes over from close range 13-21
Sam Davies gets us restarted. 13-16
Sam Davies edges Ospreys ahead with a penalty on the verge of half time. 13-16
Sam Davies' penalty attempt drifts wide after Gill was pinned for a neck roll 13-13 as we approach half time.
Nick Williams again winning the penalty at the breakdown, and Anscombe brings us back level. 13-13
Been end-to-end rugby here so far, with Dan Evans making another break, but we're looking at a potential block in midfield. 10-13
Dan Evans makes a break on the counter, and looks to send Olly Cracknell clear, but Anscombe recovers well to intercept, allowing Lloyd Williams to clear 10-13
Sam Davies adds the extras to put Ospreys three points ahead 10-13
Cory Allen is in under the sticks. 10-11
Free kick for Ospreys after their attempted driving line-out, and they opt for a scrum.
Anscombe loses his footing as he attempts a counter, and Nicky Smith wins another breakdown on the floor. Sam Davies finds the corner.
Jason Harries replaces Owen Lane, who failed to recover from an earlier niggle.
Lloyd Williams is sharp to pick up loose possession from the base of Ospreys' scrum, and Halaholo threads a ball through to the corner, but the bounce just evades Jason Harries
Dangerous turn of pace from Aled Summerhill gives Cardiff Blues some momentum, and Willis Halaholo breaks past the challenge of Justin Tipuric to advance to the edge of the 22.
Sam Davies adds a second penalty for Ospreys after Olly Robinson strayed offside on the chase. 10-6
Big strip from Big Nick to turn over possession, and Seb Davies - a centre back in the day - dinks the ball behind the Ospreys defence, and sees the bounce into touch inside the 22
Anscombe scores his, and Cardiff Blues' 10th point of the afternoon.
Some more lovely work in attack from Olly Robinson, Dillon Lewis and Jarrod Evans leads to another penalty, and Anscombe will attempt to open up a seven-point lead.
Cracking hit in midfield from Willis Halaholo and Rory Thornton, and Nick Williams is onto it in a flash to win the penalty. 7-3
Conversion good from Anscombe. 7-3
Try!!! Who ever doubted Chicken? A lovely break by Owen Lane splits open the Ospreys defence. He feeds the Lloyd Williams who releases Anscombe on the switch, and he dances his way to the line 5-3
Davies slots the penalty to get the scoreboard ticking 0-3
Sam Davies has an opportunity to open the scoring from the tee
A nice half break from Evans creates space for Aled Summerhill to stretch his legs down the left hand side, but eventually Nicky Smith wins a penalty for the Ospreys. 0-0
Jarrod Evans gets the game underway!
Sam Davies lines up for a drop goal, but his effort is wide. We remain level 23-23
Blaine Scully on Gareth Anscombe: "He's a really good professional and will be squarely focused on today. I'm confident we're going to see a typical Chicken performance"
Ellis Jenkins on Judgement Day: "It's a chance to have the bragging rights for the next few months, and there's an extra dimension to derbies, which explains the handbags."
Josh Navidi's advice to those making their first Judgement Day appearance: "Go out an enjoy it because it's a big occasion, which keeps getting bigger every year."
Ellis Jenkins, Josh Navidi and Blaine Scully will be joining us at Cardiff Arms Park at 2.00pm for a pre-Judgement Day Q&A! Head over to see what the boys think is in store at the Principality Stadium today!
Welcome to the live blog for today's massive Judgement Day encounter against Ospreys. Heineken Champions Cup qualification hopes are on the line on the final day of the Guinness PRO14 regular season.