First 15 minute of extra time gone.

Legs tired, spirit high. Who is going to deal with the fatigue may just clinch this.

Maziar Kouhyar is penalised for a shove on Chesterfield right-back Sam Curtis as he tries to bundle his way down the County left.

County have a dangerous free-kick of their own now, though... which Kouhyar will take, though it's headed well clear by the Spireites defence.

Mark Stallard
Ex-Notts County striker on BBC Radio Nottingham

It's a brave all, it's a big call but they've [Alassana Jatta and Jodi Jones] not affected the game.

A big call.

Daniel Udoh and Cameron McJannet get entangled with one another and you're expecting to see a scuffle but Fabio Borini sees it as the perfect time to strike.

Suddenly, the ball is looping in the air at pace with the Grimsby stopper off his line but Jackson Smith is quick to reset himself and jump up to claim.

Would have been quite the goal if it had gone in.

Double change from Martin Paterson.

Alassana Jatta and Jodi Jones are heading off for the hosts, with Lee Ndlovu and Maziar Kouhyar coming on for the final 23 minutes and change, trying to make the tie safe for the Magpies.

More pretty approach play for the visitors but Sammy Braybrooke's attempted lob from an angle is not struck cleanly and it's meat and drink for James Belshaw to gather in the County goal.

Nice break down the right from Chesterfield as Sam Curtis' cross from the right breaks for Dilan Markanday on the edge of the box but his half-volley cannons off a defender and loops into the arms of James Belshaw.

Gary Croft
Former Grimsby defender on BBC Radio Humberside

Some of the Grimsby players look tired, they've all put a shift in but there's plenty of time to go.

Janoi Donacien is heading off for the visitors, with Sam Curtis coming on at right-back.

Donacien was starting for the first time since January so 62 minutes was probably about his limit. He made two vital blocks in the goalmouth in the first half, though. Quite a shift.

Ben Woodburn falls to ground in the box after some messy footwork in the box and claims it's the fault of Reece Staunton.

No penalty is given.

Nick Tsaroulla's back-header in the box drifts behind for a corner, after Kyle McFadzean's towering up and under into the Magpies mixer, but the corner is too deep and County clear again.

Jaze Kabia is in a great position just on the edge of the box and unwinds but drags his shot wide.

He's had a hand in both Grimsby's goals but wasn't too close there.

Chesterfield defender Kyle McFadzean picks up a booking for a tug-back in midfield as County tried to break away.

Lee Bonis was almost threaded through by James Berry's first-time pass moments before but was sent a little left and eventually saw his effort from the edge of the box charged down.

Grimsby skipper Kieran Green trips up Haji Mnoga and picks up a yellow for his troubles.

Ryan Graydon's finish has been lacking this evening and he'll be hoping he can make amends for that in the final at Wembley.

Fabio Borini is on in his stead for this final half an hour... and, dare we say it, maybe even penalties too.

Football's the winner.

Sammy Braybrooke sprays a glorious ball wide right for Dilan Markanday who advances into the box and fires in a low angled shot which James Belshaw dives to his right to tip around the post.

Belshaw is a life-long Magpie, had a season ticket in the Kop End and was once a mascot at the age of six.

He's just kept his beloved club ahead in this tie.

Here we go then.

Extra time begins at the Peninsula.

Lee Turnbull
Former Chesterfield midfielder on BBC Radio Sheffield

That's very good recovery from Sil Swinkels. Alassana Jatta was away there.

Notts County are very dangerous on the counter attack.

Sil Swindels produces a brilliant last-ditch tackle as he races back to thwart County forward Alassana Jatta who had galloped into the box in plenty of space on the left after breaking beyond the Spirites backline.

This game is bubbling up nicely...