Kheredine Idessane
BBC Sport Scotland at Easter Road

Hibs have turned this tie completely on its head with two goals in two minutes early in the second half.

First, Elie Youan was on hand to flick in Will Fish's knockdown from a corner. Then Dylan Vente spun, completely unmarked in the area, to find the bottom right-hand corner.

Stunning turnaround. As it stands, Hibs are set to join city rivals Hearts in the semis.

Any excuse to use this. If you know, you know.

Image source, Joe

Tyrone Smith
BBC Scotland at Global Energy Stadium

It has been a lively start to the second half in Dingwall. Ten-man County are giving as good as they are getting after a first half to forget.

This still looks like an uphill task for the hosts, but as long as the deficit remains at just the one goal, the Staggies will still believe they can turn this tie around.

Martin Dowden
BBC Sport Scotland at Ibrox

Stephen Kelly's effort from nowhere should serve as a big warning to Rangers.

The home side have been utterly dominant but dipped marginally as the half wore on. They will feel this should have been done and dusted by half-time. It's not.

We're back under way in Leith and Dingwall.

Rangers have the lead at the break. They may feel they should have more, Livingston definitely feel it should still be goal-less after that controversial Abdallah Sima opener.

Image source, PA Media

Ridvan Yilmaz is penalised for a barge on Daniel MacKay as Rangers push on the left-hand side.

Must say, that looks very similar to the Abdallah Sima barge on Jamie Brandon.

Hearts are the first of four teams in the semi-final draw, which will take place straight after Rangers' quarter-final at home to Livingston tonight.

The ties are due to be played at Hampden on the weekend of 4/5 November, with the final scheduled for 17 December.

Rangers are still enjoying the lion's share of possession at Ibrox but Livingston have got to grips with the hosts' deliveries into the box.

Livi just need to hang in there and hope to prise an opening of their own with plenty of time left to turn this tie.

Kheredine Idessane
BBC Sport Scotland at Easter Road

That must be the perfect away performance so far from the St Mirren manager's point of view.

His team's shape and discipline has completely nullified the Hibs flair players, like Martin Boyle and Elie Youan, and when the chance came to hurt the home side, they took it clinically.

They worked it really well. A cross from the right nodded down by Mikael Mandron into the path of Scott Tanser, who connected beautifully with his left boot to send the ball flying past David Marshall.

Scott Tanser's sensational half-volley right on the cusp of half-time has the Buddies ahead at the break.

It sparked a pretty boring game into life.

Nick Montgomery has to rally his side if he wants a trip to Hampden soon.

Image source, SNS

Kenny Miller
Former Rangers striker on BBC Sportsound

The longer it stays at 1-0, Livi could get a chance to throw bodies forward and Rangers fans will get edgy.

Graeme Shinnie's sensational opener separates the sides at the interval, but truth be told it's been a one-sided affair.

After Jack Baldwin was sent off for the hosts, the competitive edge was lost as Aberdeen were content to play keep ball and knock it about with ease.

A long road back now for Malky Mackay's side.

Image source, SNS

St Johnstone manager Steven MacLean is at Ibrox to check out Saturday's opponents Livingston, while Motherwell boss Stuart Kettlewell is also taking in tonight's quarter-final.

Image source, SNS

Allan Preston
Former St Johnstone defender on BBC Sportsound

Joel Nouble will sleep well tonight. He is all over the place.

Kheredine Idessane
BBC Sport Scotland at Easter Road

Well, well. That's a nicely worked goal from St Mirren topped off by Scott Tanser's terrific finish, volleying left footed low past David Marshall.

The Saints do indeed go marching on for the time being.