Kilmarnock 3-3 St Mirren - Ilkay Durmus' cross is dropped into the net by Kilmarnock keeper Colin Doyle; Zeno Ibsen Rossi nods in equaliser from close range before Greg Kiltie guides in second
Joe Shaughnessy bullets home header; Ross Millen converts extra time spot kick with Jamie McGrath doing likewise for visitors with seconds left
Kyle McAllister nets clinching penalty with Rory McKenzie seeing his spot kick saved in shootout
St Mirren to face St Johnstone and Dundee United take on Hibernian in last four
The third of four Scottish Cup quarter-finals goes to penalties!
There was time for more desperate drama as Colin Doyle denied St Mirren captain Joe Shaughnessy from about six yards.
The Scottish Cup has been breathtakingly entertaining. Best cup competition around.
Jamie McGrath
Incredible drama!
A massive mix up as Ross Millen waits for his goalkeeper to come and sweep up, it allows Jake Doyle-Hayes to get a toe on the ball, and Colin Doyle clatters into him, and Don Robertson points to the spot.
Another big call! Jamie McGrath steps up and, as he usually does, converts calmly.
Image source, BBC SportKilmarnock 3-2 St Mirren
St Mirren are struggling to fashion chances here, and Kilmarnock have been working tirelessly to keep them at bay.
Will there be a final twist? Could Jak Alnwick be another luminous green hero?
Kilmarnock 3-2 St Mirren
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Kilmarnock 3-2 St Mirren
A great free-kick from the left from Cammy MacPherson, but Colin Doyle gathers in the absence of any St Mirren players attacking the near post.
They're frantically swinging balls into the box, but to no avail so far.
Kilmarnock 3-2 St Mirren
Ross Millen scores penalty in extra time
Kilmarnock 3-2 St Mirren
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Click the link here or at the top of the page to watch via iPlayer.
Kilmarnock 3-2 St Mirren
Joe Shaughnessy has another chance to score, but his header is easily gathered by Colin Doyle.
Just before that corner, Kirk Broadfoot blocked Jamie McGrath's shot, with St Mirren claiming it struck the Kilmarnock defender's hand.
Kilmarnock 3-2 St Mirren
We're off again. Fifteen minutes for St Mirren to salvage their Scottish Cup dreams.
Cammy MacPherson is on for Marcus Fraser.
Kilmarnock 3-2 St Mirren
Tom English
BBC Scotland's chief sports writer
Quote MessageI think it was the wrong call. McAllister poked the ball away from Haunstrup and it's not a penalty. Jim Goodwin will be apoplectic if this finishes 3-2
HT: Kilmarnock 3-2 St Mirren (extra time)
Also, I pulled up Alan Power for his silly foul earlier which ultimately led to St Mirren's equaliser. What a pass from the Englishman to slide in Brandon Haunstrup, who was fouled for the penalty.
Kaka would be proud.
HT: Kilmarnock 3-2 St Mirren (extra time)
That's the first half of extra time done, and Kilmarnock have their noses back in front. There will be plenty of debate about the penalty they were awarded.
But to their credit, they have continued to create even though Nicke Kabamba's injury means they are a man down.
Kilmarnock 3-2 St Mirren
Craig Levein
Former Hearts manager on BBC Sportsound
Quote MessageThe weight of the pass from Power was excellent and Haunstrup does really well getting in behind. That was a striker's tackle from McAllister.
Ross Millen (penalty)
10-man Kilmarnock are in front!
St Mirren boss Jim Goodwin will be absolutely fuming with this decision. Kyle McAllister looks to have got a toe on the ball, but Brandon Haunstrup went to deck and Don Robertson pointed to the spot.
Ross Millen rolls his penalty down the middle. Great composure.
Image source, BBC SportKilmarnock 2-2 St Mirren
Kilmarnock 2-2 St Mirren
Craig Levein
Former Hearts manager on BBC Sportsound
Quote MessageIt's been very scrappy in extra time so far. I think the players might have mentally settled for the draw and penalties here
Kilmarnock 2-2 St Mirren
It certainly looks as though Nicke Kabamba isn't going to continue. Kilmarnock now down to 10 men for the last 23 minutes.
A big shift required now for the home side.
Kilmarnock 2-2 St Mirren
Nicke Kabamba is now limping heavily. Kilmarnock have already used their four substitutes, so that could be them down to 10 men.
The striker is off the pitch as play resumes...
Kilmarnock 2-2 St Mirren
Nicke Kabamba goes so close to giving Kilmarnock the lead.
He's played through and is too quick for Joe Shaughnessy, but he struggles to get the ball out of his feet and drags his shot just wide.
A good chance gone.