Jacob Stockdale did so much right, but the finish was so bad.

It was a marvelous stepping, searing break from Stockdale, yet inexplicably the Ireland wing does not dive in, instead trying to reach down and place the ball one-handed.

There is a crucial inch of daylight between his fingers and the ball on the replay and that is damning.

No score.

Ulster's wing Robert Baloucoune spills his attempt to claim Luke McGrath's box kick. Leinster realise that means there is no-one at home down his left wing.

Another box-boot from McGrath.

Baloucoune gets back to clear up, but his side have leaked a whole lot of yards.

Oh! Garry Ringrose's clearing kick is charged down by Marcell Coetzee!

How's the bounce?

It just, just eludes the chasing Rob Herring.

An early heart-stopper of a scare for Leinster in the second half.

Billy Burns gets us back up and running...

Kieran Treadwell pounced on Garry Ringrose's charged-down kick to go over after five minutes...

Image source, Getty Images

Image source, Getty Images

...before Ross Byrne drifted in on 10 minutes.

Budge Pountney
Former Scotland flanker on BBC Radio Ulster

The atmosphere has been electric and it's all down to the rugby that's been on show. The collisions are massive, the rucks are highly contested. Every single time there's someone trying to turn the ball over and at the moment turnovers are key.

Leinster-Ulster

Possesion: 58%-42%

Territory: 60%-40%

Metres gained: 103-126

Turnovers conceded: 5-6

Tackles: 61-81

Penalties conceded: 1-2

Ian Humphreys
Former Ulster fly-half Ian Humphreys on BBC Radio Ulster

What an unbelievable 40 minutes. Leinster have dominated in patches. Ulster's defence has been so good and they've been clinical when they've had the chance. Ulster need to make sure they stay accurate and keep doing what they're doing.

A brutal first half and, for all bumps and bruises, I'm not sure we are any closer to working out our third semi-finallist

The clock is in the red. Leinster are working through the phases, trying to find a hole...

Ulster nose back ahead. It could have been more. Stuart McCloskey's dinky grubber kick finds wing Robert Baloucoune, but the Ulster wing is snared by Luke McGrath.

So we come back for the gimme penalty right in front...

Cian Murtagh
BBC Sport NI at Dublin's Aviva Stadium

The sight of Rory Best with his head in his hands on the sideline was a huge blow to Ulster.

Although he has yet to confirm it, the Ireland captain is probably in his last season with Ulster and he is desperate to end it with some silverware - can the rest of the team do it for him?

On the pitch, the line speed from both defences is ferocious - some of the Leinster players will have nightmares about Stuart McCloskey tonight

And Leinster lead for the first time as Ross Byrne slaps over the kick...

Leinster so close!

Ross Bryne takes the penalty-advantage chance to dust off his cross-kick, picking out Dave Kearney.

Robert Baloucoune brilliantly tidies up around the edge to deny the Leinster wing. But we are heading back for the initial scrum offence by Ulster...

Ian Humphreys
Former Ulster fly-half Ian Humphreys on BBC Radio Ulster

Ulster have defended really comfortably so giving Ross Byrne an easy shot will be frustrating for the coaches. A lack of discipline can end up costing the game.

Over it goes.

By the way Johnny Sexton is in the house, sitting alongside Robbie Henshaw in the posh seats and expensive menswear.

Marcell Coetzee is having an indifferent first half. The Ulster number eight is done for going to ground at the breakdown.

That offers up a penalty shot to Leinster and this time they are going to take up the change of a very kickable penalty...

Ian Humphreys
Former Ulster fly-half Ian Humphreys on BBC Radio Ulster

We were all out of our seats then. We just saw the danger of Ulster's counter-attack and the pace they have.

And there is the other side of Sean Cronin's game...

The Leinster hooker over-throws over the back of the line-out and John Cooney hoofs clear for Ulster.

Moments later, Ulster full-back Michael Lowry thinks he is over, but play is brought back, rightly, for a knock-on by Marcell Coetzee.