United equalised through Nicky Clark's controversial penalty. With 10 minutes remaining, will either side find a winner?

Image source, SNS

A break in play as Charlie Trafford hobbles off to be replaced by Nathan Austin.

Dundee United keeper Benjamin Siegrist has earned a couple of bowls of homemade soup tonight. The keeper comes galloping off his line to deny Jordan White.

"Wonderful save," purrs BBC Sportsound pundit John Hughes.

BBC Sportsound pundit John Hughes: Soft penalty, Paul McMullan bought it. Steven McLean loves to give a penalty. It's 50-50, you can see why he gave it but I don't think there's enough in it. If you know the game, you know what McMullan is trying to do and I don't think there's enough physical contact for that to be a stonewall penalty.

What a difference a goal makes. Suddenly, Dundee United, roared on by the home supporters, are thundering forward in search of a second goal.

Tannadice is crackling with atmosphere.

The hosts are awarded a penalty - much to the anger of the Inverness CT players. Substitute Paul McMullan tumbles under a Jordan White challenge.

Steven McLean points to the spot, Inverness are going bananas.

Charlie Trafford fires a shot whistling inches wide of goal as the visitors look to double their lead.

Again, Inverness CT come forward. Liam Polworth denied by Benjamin Siegrist

With half an hour remaining, Inverness CT lead, courtesy of Joe Chalmers' sensational strike.

Image source, BBC Sport

Dundee United's tempers beginning to fray. Fraser Fyvie earns a booking for chopping down Liam Polworth.

As things stand, John Robertson's side look comfortable holding their 1-0 goal lead.

Again, Inverness CT come forward in search of a second goal. Liam Polworth's free-kick is palmed away by the Ninja-like Benjamin Siegrist. The United keeper ensures Joe Chalmers, following up, won't find the net again.

Robbie Neilson rolls the dice with his first change of the cup tie: Paul McMullan is on for Cammy Smith.

BBC Sportsound pundit John Rankin: I don't think it will be long before Robbie Neilson makes a change. He's got Paul McMullan, Sam Stanton and Aidan Nesbitt on the bench who can all come on and change the game. It wouldn't surprise me if he put one in the middle of he pitch and just went for it with half an hour to go.

Joe Chalmers has already scored once and appears in the mood for a second. However, United repel the danger, dispossessing the dangerman and clearing their lines.

Will Inverness CT see this out to book their place in Monday's draw for the semi-finals or will Dundee United come roaring back?

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The visitors start the second half the way they finished the first: on the attack. Liam Polworth fires a shot straight into the grateful arms of goalkeeper Benjamin Siegrist.

We're back under way at Tannadice.

Aberdeen boss Derek McInnes was "disappointed" his team weren't able to beat Rangers after taking an 11th-minute lead in their 1-1 draw earlier today.

"We've lost a goal from a set-play - that and the fact we haven't scored a second goal were the only disappointments," he told BBC Scotland.

Image source, SNS

"We had better chances, more pressure on Rangers' goal than was on our own. Although they had a lot of possession between centre-backs in their own half, we were very good in terms of them not opening us up and having too many chances.

"We set out to try to be as attacking as we can, we broke well, looked after the ball in certain areas, and I thought we were good value to win the game."

BBC Scotland's Jane Lewis at Tannadice: "John Robertson remonstrating with the fourth official after he felt Coll Donaldson was sent sprawling just before half time. He wasn't happy at all as referee Steven McLean waved play on. At half-time ICT deserve their lead and for the most part have been the better side.

"They are controlling the midfield and the goal was a terrific strike."