Kerr heads in corner after Murphy & Irvine hit bar for Hibs
Rooney bullets in from free-kick & Conway adds third
Winners will play St Mirren or Livingston in the final on 28 February
Considine
Aberdeen finally get their second goal, but what are Motherwell doing in defence?
A corner kick comes into the box, the ball takes a slight deflection, and as Motherwell attempt to play offside Andrew Considine collects it, runs across the box, and taps in.
Image source, BBC SportAberdeen 1-0 Motherwell
Sam Cosgrove's luck is out just now. Ryan Hedges slips a through ball to the normally deadly Aberdeen striker, putting him clear, but his first touch is woeful - toe poking it to the goalkeeper.
Rangers 4-0 Ross County
Will we see any more goals at Ibrox? The hosts have scored four and appear in the mood for more against County's chocolate teapot defence.
The visitors have struck the woodwork twice since the break but have endured a miserable afternoon at both ends of the pitch...
Steven Gerrard's side are heading 23 points clear at the top of the table.
Aberdeen 1-0 Motherwell
For all Aberdeen's chances, it is only 1-0 and Devante Cole gets a free header in the box but can only direct it into the hands of goalkeeper Joe Lewis.
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Aberdeen 1-0 Motherwell
Ash Taylor heads home from a corner kick, but the hosts' celebrations are short-lived as the goal's ruled out. Looks like it was offside after the Dons took a short corner.
Another superb save from Motherwell goalkeeper Liam Kelly, who makes a one-handed save to push away Matty Kennedy's effort.
St Johnstone v Hibernian (17:30)
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Aberdeen 1-0 Motherwell
Motherwell goalkeeper Liam Kelly makes a brilliant save! He somehow gets his fingertips to Lewis Ferguson's header and diverts it wide for a corner kick.
Manager Graham Alexander then gets yellow carded, as he continues to vent his fury at something.
Pittodrie is bubbling away with chances, intrigue and dollops of drama...
Ryan Jack
Ryan Jack has only been on the park for a matter of minutes before the Scotland midfielder marks his return from injury as a substitute by slotting home Rangers' fourth goal by side-footing home a low Ianis Hagi cross.
Image source, BBC SportAberdeen 1-0 Motherwell
Ryan Hedges goes agonisingly close to doubling Aberdeen's lead, but his shot goes the wrong side of the post.
Then Scott Wright outpaces the Motherwell defence but can't nick the ball past the goalkeeper.
With the extra-man advantage Aberdeen are unsurprisingly putting the pressure on the visitors.
Harry Smith, the forward on loan from Northampton Town, makes his Motherwell debut from the bench.
Rangers 3-0 Ross County
So close to a second fine finish of the game from Joe Aribo.
The midfielder back-heels a James Tavernier corner towards goal and goalkeeper Ross Laidlaw does well to palm it off the line.
Orsi
Liam Boyce
Rangers are stung into a response amid the visitors sparking into life and Alfredo Morelos sends a low drive wide before a series of corners that County survive.
Tumilty
Rangers 3-0 Ross County
County strike the woodwork for a second time after the break.
Alex Iacovitti has a great chance as he rises to meet a free-kick into the penalty box, but the centre-half tries to loop his header over goalkeeper Allan McGregor and it strikes the crossbar before bouncing clear.
Liam Polworth
The visitors are a goal down and now down to 10 men.
Liam Polworth was booked in the first half, but this time he appeared to get a straight red card.
He was down injured holding his shoulder after being fouled, and as he got to his feet he was sent off. There's a bit of confusion what he's been sent off for - possibly he has said something to referee Craig Napier.
Lovely play from Aberdeen. Ryan Hedges, Scott Wright and Tommie Hoban knock the ball about with aplomb on the right hand side with a series of flicks, back heels and nice passes. The cross reaches Lewis Ferguson who can't get the ball from under his feet, then Funso Ojo hits a shot against a defender.
Rangers 3-0 Ross County
A shot on the turn from Alfredo Morelos, but goalkeeper Ross Laidlaw gathers the Rangers striker's effort at the second attempt.