Posh probing but the Chorley defence is packed.

Scott Leather gets a toe on the ball and runs clear before being fouled midway inside his own half.

Reece Brown is booked for that challenge.

Time to run the clock down.

Goalscorer Connor Hall is heading off for Chorley.

Willem Tomlinson replaces him.

There were 90 league places between these two sides at kick-off.

Chorley have had more attempts at goal and deservedly lead.

The Magpies have looked fairly comfortable in the past few minutes and are closing in on a historic win.

Posh really haven't had any chances since going 2-1 behind.

Surely Darren Ferguson's men will carve out an opening at some point.

Chorley boss Jamie Vermiglio hasn't even made a substitution yet - there must be some tired legs out there.

Free-kick to Chorley almost 30 yards out.

Harry Cardwell steps up to take it, but it is well clear of the bar.

Into the final 10 minutes.

Non-league Chorley are closing in on a place in round three.

It's been a dramatic second half so far. Still plenty of time for a twist in the tale.

Peterborough goalscorer Jack Taylor gets the first booking of the game for a late challenge on Elliot Newby.

Huge moment.

Harry Cardwell sends his penalty just to the left of centre.

But Posh keeper Christy Pym dives the right way and sticks up a strong left hand.

He palms the ball away and Posh defender Frazer Blake-Tracy is first to the ball to clear.

Will Chorley pay for that miss?

Another corner from Elliot Newby causes chaos in the Posh box.

Mark Beevers hauls down Harry Cardwell and the referee points to the spot!

These chances seem like ancient history now, but here are the two times Chorley hit the woodwork in the first half when they were 1-0 down.

The Magpies have turned the game around since the break to lead through goals from Connor Hall and Lewis Baines.

Posh are enjoying more of the ball now as the Magpies sit back and look to defend their lead.

Can the visitors hold on?

Last change of the 90 for Posh as Idris Kanu replaces Ryan Broom.

Chorley came from 2-0 down to beat Wigan in the first round.

Jamie Vermiglio's side went behind in the second minute here, but have showed character to come back into the game.

The National League North side have never reached the third round in their history.

Posh are rattled.

Second change by Posh boss Darren Ferguson.

Niall Mason comes on for Dan Butler.

League One Peterborough have 25 minutes to avoid a giant-killing.

First change of the game and the hosts make it.

Flynn Clarke comes on for Sammie Szmodics.

The 20-year-old has three goals in six appearances, with all those strikes coming in the EFL Trophy.

It's a straight swap and he'll slot into the number 10 role.

Chorley work a good passing move with an overlap on the left flank and Harry Cardwell's effort at the near post is deflected behind for a corner.

The set piece is cut back to the edge of the area but doesn't come off, and Andy Halls drives a shot over the Posh bar from distance.

Chorley keeper Matthew Unwin comes to the edge of his are to claim a ball forward looking for Mo Eisa.

It's been a subdued start to the second period.

Image source, Getty Images

Posh have only lost one of their past nine games at home.

Darren Ferguson's men have won six of those games.

Close out this game and they'll be in the third round for a sixth consecutive season, and a 14th time in 15 years.