Priestland is on to win his 50th cap in Europe's top competition. Tomos Williams puts in a huge tackle down the blind, allowing Boyde to win a penalty. Cardiff will attack from the edge of the 22. 33-33
Smith dances through and we're now back level heading into the final moments of a thrilling contest at CAP. 33-33
Cardiff's defence are flying off the line, with one heroic tackle after the other but the advantage once again falls Harlequins' way. The series of penalties sees Kirby Myhill shown a yellow, meaning brother Torin will come on for a scrum and debut. Lane makes way. 33-26
Huge shift from the pack to deny Quins' first drive, but Trainini again penalises the hosts. The visitors go again... 33-26
Breathless stuff here as both sides go at it hammer and tongs. Dillon Lewis and Domachowski look to have combined in midfield to secure a huge turnover, but are penalised at the breakdown. Huge shift from the prop duo. 33-26
Just as things start to slow down in attack, Tomos Williams pops his head up from the breakdown and rifles the ball downfield, executing a pin-point 50:22. 33-26
The scoring continues but this time it's Quins who pull one back. Care snipes over from the close range maul as the visitors bring it back to a 7-point game. 33-26
Hollywood rugby on show here at the Arms Park as Cardiff strike for a sensational score, with Domachowski powering over after Evans and Lee-Lo instigate the initial break from their own 22. 33-19
After Dillon Lewis powers over from close range, Owen Lane is over for a quickfire second to secure the bonus point. Wonderful work by the backline, who ship wide to Amos. The full back threads the ball through and Laney is on hand with an instinctive finish. 26-19
The line-out is claimed and Kirby Myhill peels away from the maul, stopped two meters from the ruck. We continue to hammer on the door for phase after phase, and Quins are forced to concede two penalties on their own line. Dombrandt sees yellow as a result. 14-19
Dino Lamb is pinned on the floor and the visitors are marched back a further 10 meters after kicking the ball away. It allows Evans to put us in the corner. 14-19
Dombrandt breaks in midfield and a long, bullet pass puts Northmore clear as Harlequins take the lead. 14-19
Care sends it out on the full, giving Cardiff the line on halfway. They go through the phases, with the likes of Lewis-Hughes and Myhill making the hard yards. It seems to have worked but the final pass is fumbled out wide on the edge of the 22. 14-12
The try is chalked off for offside in the build up to that one, so we remain ahead. We come back for a Harlequins penalty on their own 22. 14-12
Jarrod Evans gets us back underway here but Harlequins instantly strike back to take an early second half lead. Smith's chip behind is gathered by Marchant. Adams recovers brilliantly to bring down the centre, but Care is on hand to take the offload and run in. 14-17
Harlequins finally get the breakthrough, with a bit of fortune, but once again it's Smith's crossfield kick that's the catalyst. Murley and Amos compete in the air, but Green feeds on the scraps to dot down. 14-12
The penalties mounting against the hosts here and Arhip is sent his marching orders by Trainini after being penalised at scrum. Dillon Lewis is on for this scrum, replacing Lane while Arhip is in the bin. 14-7
The Cardiff defence holding firm so far as the clock turns into the red. One final opportunity for the visitors, who look to bring things level at the break. 14-7
Plenty of noise coming from the non-playing squad members in the crowd, looking to provide a boost for the home side here. Meanwhile, Marchant cuts a wicked line in midfield to break clear but Lane is on hand to stop the attack in its tracks, bundling Murley into touch. 14-7
Cardiff counter once again, with a couple of offloads and a fortuitous bounce of the ball, and win the penalty. However, Evans can't extend the lead from the tee. 14-7
Unbelievable step from Tomos Williams to break from a midfield scrum. He beats two more defenders before a long pass finds Lane. He is just denied his second by Lawday's covering tackle but the visitors somehow pop out with possession and hack downfield. 14-7
Harlequins looking to turn the screw through their pack, but Rhys Carre is on hand to claim a vital turnover deep in his 22, allowing Evans to relieve some of the pressure. 14-7
Now it's time for Quins to put the pressure again, after Tyrone Green claims Marcus Smith's Garryowen to put them on the front foot. A penalty follows and Smith once again puts it in the corner. 14-7
Cardiff opt for a tap penalty from close range and a couple of phases later it's James Ratti who bulldozes over to put the Blue and Blacks ahead. No mistakes from Evans with the extras. 14-7
Superb work from the hosts, who come inches away from taking the lead. A counter paves the way for Lee-Lo to burst down field. He has support either side, and ultimately releases Adams but brilliant defence denies the Lion. However, Quins are penalised close to the line. 7-7
Clever kick behind by Tomos Williams pins Northmore back. The centre returns but Cardiff are able to counter, going from right to left and back again. Possession reaches Lane, who beats two defenders to rip clear of the Quins defence and run in. Evans slots the extras. 7-7
After a good carry in the wide channels from Amos, Cardiff are awarded a penalty and Tomos Williams takes the quick tap, setting up a promising opportunity for the hosts. The ball is shipped wide to Lee-Lo, who goes close, but Quins win a crucial turnover to clear. 0-7
Quins continue to pressure deep in the 22 and Marcus Smith spots Louis Lynagh in space out wide. The outside half puts in the kick-pass, and the wing slices back inside to finish for an early score. Smith converts. 0-7
Ealy penalty for Quins and Marcus Smith sends it to the corner. The visitors set up a drive and the initial shove is dealt with by the hosts. 0-0
Marcus Smith kicks us off for this capital vs capital clash at the Arms Park! Y maswr Marcus Smith yn cychwyn y gêm rhwng clybiau prif-ddinas Cymru a Lloegr. 0-0
Cardiff Rugby
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