Big chance! David Ofere makes a nuisance of himself, getting in front of Celtic keeper Lukasz Zaluska who comes charging out, to chest the ball down for Nick Ross, who scoops the ball over on the half-volley from the edge of the box.

A quick break for a guzzle of energy drinks and we're off again. What next in this amazing game?

Marley Watkins is booked after an ugly tussle with Celtic full-back Emilio Izaguirre and the extra-time half-time whistle diffuses the situation as tempers flare.

Ryan Esson will be feeling the heat after that blunder. The ball did take an unusual skip off the grass but the Inverness goalkeeper really should have stopped that shot.

What a game! Ten-man Celtic are level as John Guidetti takes aim for the keeper's corner from the free-kick 20 yards out. The ball takes a big kick off the turf and bounces over a diving Ryan Esson.

More fuss as Inverness sub Nick Ross is shown a yellow card for what was a perfectly good challenge. Ross Draper did, however, wipe out an opponent and somehow misses the booking that would have ruled him out of the final.

No sign of Inverness shutting up shop as the hugely impressive Graeme Shinnie powers forward only to be crudely upended by Nir Bitton. The free-kick is wastefully hoisted into the arms of Celtic keeper Lukasz Zaluska.

Celtic switch strikers as they seek a response. John Guidetti replaces Leigh Griffiths.

The Highlanders are ahead! Edward Ofere has not had the best of games but he does very well to drill the ball into the corner from 17 yards as Marley Watkins knocks on a Graeme Shinnie cross with his thigh.

Inverness midfielder Ryan Christie wriggles through a couple of challenges and hits a powerful strike from 20 yards. Lukasz Zaluska does well to get two hands to it and beats the ball away.

Stefan Johansen clips a nice pass with the outside of his boot to Aleksander Tonev, who has a swing at it on the volley, sending the ball wide from the edge of the penalty area.

Euan Massie: "#bbcscotfootball Dons disallowed a goal in a semi for nothing and nobody says a thing. Celtic don't get a decision and everyone goes crazy."

Gordon Penman: "#bbcscotfootball Maybe it's Celtic who'll be 'going ballistic' at the #sfa. Would be surprised if Brown finishes the game on the pitch!"

We're off again. No changes in personnel, although there must be a lot of tired legs in both sides.

Image source, SNS Group

Celtic were fuming at half-time when they were denied a clear penalty, which may have put them 2-0 up and would definitely have reduced Inverness to 10 men.

Early in the second half, it was Celtic who found themselves a man short due to a red card and Greg Tansey levelled with a cool spot-kick.

These teams have met four times this season and every game has been really tight. Who's going to blink first this afternoon?

Well, there has been no shortage of thrills and spills and controversies in this one and we'll get a bonus half hour now.

Emilio Izaguirre swings a cross in from the left and it's completely missed by Inverness defender Josh Meekings but Leigh Griffiths cannot profit from the slip because he, err... slips.

Marley Watkins scurries after a long ball and Celtic replacement keeper Lukasz Zaluka is off his line quickly to gather at the edge of the box, after a wee fumble.

We'll get five minutes of stoppage-time. Who fancies being a hero?

Kris Commons limps off for Celtic and we get a rare sighting of Aleksander Tonev. Nir Bitton looks to be struggling too but he'll soldier on.

David de la Fawkes: "#bbcscotfootball I get the feeling Celtic fans are the only ones up in arms at the decisions today - someone mentioned something about karma"

Paul Dundas: "@ScottishFA Embarrassing performance from officials for a semi-final in the national cup competition #bbcscotfootball"

topscotsbloke: "#bbcscotfootball I think this Ref should consider a change of career after this performance today fair do's to Inverness though."

Stephen Hay: "I think #Celtic should play with 10 men every week. Makes it interesting. #bbcscotfootball"