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
Kilmarnock 2-2 St Mirren
Tom English
BBC Scotland's chief sports writer
Quote MessageSt Mirren have come back so often to win this season, there's an awful lot of spirit in that side. I won't be surprised if this goes to penalties now
Kilmarnock 2-2 St Mirren
Extra time is up and running!
Rory McKenzie and Gary Dicker have come on for Kilmarnock, with Chris Burke and Greg Kiltie going off.
FT: Kilmarnock 2-2 St Mirren
The Scottish Cup is magnificent.
Extra-time for the third time in four quarter-final games. Joe Shaughnessy's late header rescues St Mirren, for now at least.
Kilmarnock 2-2 St Mirren
Craig Levein
Former Hearts manager on BBC Sportsound
Quote MessageColin Doyle's just made up for that early blunder, that was a wonderful save.
Kilmarnock 2-2 St Mirren
Jamie McGrath finds Colin Quaner at the back post in acres of space, he's slow to get it out of his feet, and Colin Doyle manages to get out to get something on the shot.
Great chance for St Mirren. They've been the better side since Jim Goodwin made the changes and switched formation.
Kilmarnock 2-2 St Mirren
Shelley Kerr
Former Scotland head coach on Sportsound
Quote MessageYou could see that coming with the way Kilmarnock were set up for that freekick. That defensive line was all over the place
Joe Shaughnessy
Scenes!
The St Mirren captain rescues his side. He just gets the better of Kirk Broadfoot to head into the back of the net.
Are we heading for extra time yet again?
Image source, BBC SportKilmarnock 2-1 St Mirren
Alan Power does what Alan Power does and clatters into a challenge, so St Mirren have a free kick in a good position here.
Power has been great again, to be fair. But he does love a foul.
Kilmarnock 2-1 St Mirren
St Mirren need to test the resolve of Colin Doyle in these final 10 minutes. He's been shaky with what little he's had to do so far.
But Jim Goodwin's side just haven't worked him hard enough.
Nicke Kabamba replaces George Oakley for Kilmarnock. A great shift from the big man.
Kilmarnock 2-1 St Mirren
Craig Levein
Former Hearts manager on BBC Sportsound
Quote MessageDoyle looks a bag of nerves. That was another simple ball right into his chest and he takes two goes at it before he has it under control. He got away with one
Kilmarnock 2-1 St Mirren
A frantic period of pinball in the Kilmarnock box eventually sees Youssouf Mulumbu clear.
Richard Tait then puts in another brilliant cross, and Marcus Fraser gets his head to it at the back post. Colin Doyle just about keeps it out.
Better from St Mirren.
Kilmarnock 2-1 St Mirren
George Oakley goes incredibly close to Kilmarnock's third. He flings himself to connect with a near-post cross but can't guide it into the net.
He got in front of Conor McCarthy again...
Kilmarnock 2-1 St Mirren
Conor McCarthy will be having nightmares about George Oakley for the next week. He's been all over him, not giving him a minute's piece.
Will be thinking he's under his bed when he goes to sleep...
Kilmarnock 2-1 St Mirren
Shelley Kerr
Former Scotland head coach on Sportsound
Quote MessageGeorge Oakley has been a real handful tonight. He's kept the ball well, whether it's been in the air or on the ground and his running into the channels gave Kilmarnock a goal too
Kilmarnock 2-1 St Mirren
Better from St Mirren as Jay Henderson and Colin Quaner combine to tee up Jamie McGrath, who curls just wide.
He was aiming for the top corner, and wasn't miles off it.
Kilmarnock 2-1 St Mirren
Conor McCarthy takes a sore one from Kilmarnock's George Oakley. He's shown the yellow card. No intent, but he catches the St Mirren defender in the face with his arm.
Kilmarnock 2-1 St Mirren
St Mirren strikers Kristian Dennis and Lee Erwin are both replaced, with Colin Quaner and Ethan Erhahon coming on.
Kilmarnock 2-1 St Mirren
Shelley Kerr
Former Scotland head coach on Sportsound
Quote MessagePinnock is doing very well in the second half and is causing St Mirren some real problems. Kiltie's shot is too close to Alnwick but it's still a good save
Kilmarnock 2-1 St Mirren
Another big chance for Kilmarnoxk!
Greg Kiltie and Mitch Pinnock combine again, as the latter takes a fantastic couple of touches to tee up the former, who side-foots towards the top corner, only for Jak Alnwick to tip the ball over.
Kirk Broadfoot then has a superb chance to head in from the resulting corner, but he directs it straight at the goalkeeper.