Gareth Delve
Former Wales international on BBC Radio Wales

Good defence there by McNally.

Cardiff's timing was just about on the right side of perfect there.

So frustrating for Cardiff.

A poor clearance kick by Johan Mulder from the restart and then Liam Belcher drags down a line-out drive.

Stormers are back on the attack in the 22... but a big stand from Cardiff.

Lock Josh McNally holds up the maul and it's turned over.

Now it's just the small task of a solid scrum and long clearance... but Stormers go early and it's a free-kick to release the pressure for now.

Assiratti went down after that scrum and has been permanently replaced by Sebastian.

Gareth Delve
Former Wales international on BBC Radio Wales

Superb carry from Basham.

Every time he's had ball in hand, he's looked a threat.

Cardiff are back to 15 and immediately go on the attack with a huge burst by Taine Basham.

Stormers are stretched and Ioan Lloyd puts a grubber through.

Damian Willemse gets back ahead of Cam Winnett but is forced to concede a five-metre scrum.

Gareth Delve
Former Wales international on BBC Radio Wales

Cardiff are certainly not out of this game but they need to maintain that discipline and make sure they keep players on the park.

Former Wales hooker Ken Owens speaking to S4C:

"Cardiff started really well, they put Stormers under pressure.

"But Stormers are back to knowing what they're doing.

"When you're constantly under pressure, something is going to turn and Stormers just grew into the game."

Image source, Huw Evans Picture Agency

Sacha Feinberg-Mngomezulu gets the game back under way with Cardiff still down to 14 men after Keiron Assiratti's yellow card.

Image source, Huw Evans Picture Agency

Granted, it looks unlikely that the information below will be needed but you never know...

Play-off matches can be tense and tight, as was shown last year when Sharks beat Munster 6-4 in a place-kick shootout.

Here is the rundown of what happens if the scores are tied at the end of 80 minutes:

• Extra time will be played. This is two periods of 10 minutes.
• If still tied, the club with the most tries in the match, including extra time, is the winner.
• If still tied there will be a place-kick competition.

Things have changed since Martyn Williams’ woe against Leicester at Principality Stadium. These are the shootout rules:

• Each team nominates three goal kickers who take six place kicks between them from different spots along the 22-metre and 10-metre lines.
• If teams are tied at the end of their six kicks then it goes to sudden death.
• Only players on the field at the final whistle of extra time can take part in the shoot-out – those in the sin bin are not eligible.

Image source, Getty Images

One semi-final has already been decided after Bulls eased past Munster in the first of Saturday's quarter-finals.

The South Africans ran in six tries when beating the Irish province 45-14 in Pretoria.

Bulls will now join Munster in flying to Europe - they take on Glasgow in a semi-final at Murrayfield.

The table-topping Warriors were made to work for their quarter-final victory against Connacht, eventually getting over the line 33-21.

Image source, Rex Features

It's Stormers in control at half-time, who will they take on if they finish the job?

The winner will go on to face either Leinster or Lions, who meet in Dublin tonight (20:00 BST).

The Irish province are hot favourites to bounce back from their Champions Cup final disappointment against Bordeaux-Begles.

If Leinster, seeded second, win then the semi-final will be in Dublin while if seventh seeds Lions cause an upset then either Stormers or Cardiff will have home advantage.

Gareth Delve
Former Wales international on BBC Radio Wales

It's the set-piece that has totally knocked them out of this game so far in that half.

It was really telling, the words from John Dobson initially that they weren't allowed to scrummage and put their mark on the game two weeks ago.

You just wonder how much of that was imprinted, you have those conversations with the referee before the game.

Gareth Delve
Former Wales international on BBC Radio Wales

Crucial turnover there.

Cardiff need to get back in and regroup.

Another moment for Dan Thomas' highlights reel - the open-side gets over the ball to win a penalty and save the day.

Stormers are denied a fourth try before the break but they are in control and look in good shape to make the semi-finals.

Cardiff need something special... and to get the first score of the second half.

Stormers are going for the kill.

A superb 50-22 by scrum-half Imad Khan gives them a chance for a fourth try on the stroke of half-time.

It's been defence, defence, defence for Cardiff since they scored the opener (through their defence).

Gareth Delve
Former Wales international on BBC Radio Wales

That's the threat of this Stormers team.

They've created very little.

Most of their pressure is purely through that forward dominance.

Giving Zas a one-on-one, the offload out the back, and he steam rolls Cam Winnett.