Alexander-Arnold's free-kick hits the wall and is deflected out for a corner.

Oxlade-Chamberlain is over it but for the second time in the game, his corner flies straight into the hands of Ben Foster.

Foster plays it quickly down the left to Gareth Barry but the midfielder is dragged down by Can - who is clearly frustrated by Liverpool's lack of consistency.

Image source, Reuters

Strong defending from Alberto Moreno. The Liverpool left-back tackles Krychowiak and Emre Can puts Roberto Firmino on his way.

It's eventually broken down as Gareth Barry fouls Sadio Mane on the edge of the box.

You can hear the frustration of the Liverpool fans as yet another ball comes into the box from West Brom and it's met by hesitancy from the defence.

This time is Trent Alexander-Arnold who takes his time clearing the ball.

Liverpool attack with pace and Grzegorz Krychowiak has no other option but to pull Roberto Firmino's shirt and drag him back.

The hosts take a quick free-kick but Trent Alexander-Arnold's cross is mishit and it sails out for a goal-kick.

Anon: Every time VAR has been introduced to a sport, whether that be rugby, cricket or tennis there has always been an adjustment period and it’s no surprise to see that is the case with football. Give it some time!

Liverpool are unbeaten in 19 games at home this season but that record could be broken today - and more importantly, they could be out of the FA Cup.

Will we see a comeback in this second-half?

At the moment, it's West Brom who are creating the chances.

Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live at Anfield

Simon Mignolet doesn't look strong enough at all, he's so easily beaten, but he's got away with it because there was just the six West Brom players offside there.

Image source, Reuters

West Brom have a corner.

It's played long and high but Chris Brunt, in space, fancies himself on the volley. He completely miscues it and it should be a simple catch for Mignolet but he somehow manages to let it slip and it's in the back of the net.

Luckily for him, it bounces off one of the six West Brom players who were off-side.

Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live at Anfield

I don't expect the second 45 minutes to be dull here, because Liverpool need to go for it, they're shooting towards the Kop, and the fans are really up for this.

The second-half has started in much the same way the first ended.

Matt Phillips almost skips away in the box but he's pushed too wide and his shot is saved by Simon Mignolet.

Roberto Firmino's shot is then blocked at the other end and Liverpool earn a corner. It's parried away but the Reds regain possession.

Kim Coates: VAR should be easy to use but it's a joke. Is every goal and penalty decision going to be looked at? Wait until it goes against a big club. Turning football into a sterile game.

Javel Bleach: It was a foul, a penalty, VAR was right, the world saw it, and luckily, this time, the ref was right too. No polemic. Let the game be won by the better team, not by bad decisions.

David Smith: Why can't the ref make the box sign when he's referring a decision instead of at the end, like in cricket and rugby. That way the crowd have some idea.

Gyimah: The VAR is certainly a game-changer and you wonder why it took so long, but the players should stop the heckling and following the referee during VAR decisions - you don't see that in NFL and cricket.

How much drama will there be in the second-half?

We're about to find out.

Neil Yang: Name one team which spent £75m on it’s defence and yet concede 4 against the bottom two sides in the league in succession. Remarkable. What a waste of money.

Phill Cottam: Man of the Match sorted already...VAR. Hasn't put a foot wrong!

I see what you did there Phill...

Dan Allott: The only thing that was a shambles in that first half was the Liverpool performance.

Chris: I love the new technology but Liverpool's defending will cost them this game.

Matt: VAR - Vexing, Atrocious, Ridiculous... Detracting from the sport.

Aodhan: VAR is in its infancy and people saying it’s a joke, if something that helps the referee make the correct decision is a joke then we may as well not have a referee.

Marlo: The only thing more shambolic than Liverpool's defending is the application of VAR.

Mark: VAR works in rugby and cricket, which are more stop-start games, in football for me it just stops the flow and the drama of the game to a certain extent. Not convinced.

Sunil: VAR means you can’t even celebrate a goal anymore. The decisions may be right but the flow of the game is completely ruined! And the fans at the ground are completely in the dark.

Places are filling up fast for the FA People's Cup - the free five-a-side competition with 18 different categories - so don't miss out.

You could get to play at St George's Park and go to the FA Cup final. Find out all the details here.

Image source, BBC Sport