Christos Tzolis wins the penalty for Arsenal.

He is caught and the referee didn't hesitate. Viktor Gyokeres to take the penalty...

You get the feeling that much of Liverpool's success this season will come down to how well Alexander Isak and Florian Wirtz perform.

They're both capable of something special.

Arsenal are inviting Dortmund out of their shape.

Viktor Gyokeres is playing the ball down nicely for his team-mates too.

Kai Havertz gives away a cheap free-kick. He holds Carney Chukwuemeka and the referee gives the free-kick to Dortmund.

Borussia Dortmund have a free-kick out wide.

Ex-Manchester United man Marcel Sabitzer plays a poor ball into the box. An easy clearance for the Gunners.

Alex Howell
BBC Sport Arsenal reporter at Emirates Stadium

It was an unusual way for Arsenal to concede their third goal as they are usually so reliable from set-pieces.

Mikel Arteta has continued to rotate the minutes of his players though and 16-year-old Marli Salmon is now on at centre back with Piero Hincapie at left back.

Max Dowman isn't short of confidence, is he?

He could have played Kai Havertz in, but the youngster take it on himself.

A comfortable save for Alexander Meyer.

Arsenal are pressing Dortmund high, but the German side is doing well to break the press.

Max Dowman working his magic down the right-hand-side.

Arsenal win a corner and the ball drops to Ethan Nwaneri on the edge of the box.

Alexander Meyer has to produce a great save to stop Nwaneri's shot.

And that's the end of the first half at Anfield.

A pretty entertaining one!

Some subs for the Gunners...

ON: Piero Hincapie and Marli Salmon.

OFF: Gabriel and Riccardo Calafiori.

Liverpool almost retake their two-goal lead. Dominik Szoboszlai sends in the free-kick and Virgil van Dijk is first to it but he can only head over the top.

Aadam Patel
Football Reporter at Anfield

Complete silence around the ground when Aleksandr Golovin's penalty hit the back of the net. It's always a bit weird when there's no away end or away fans in sight.

Virgil van Dijk gets a little too tight to Aleksandr Golovin and down he goes in the box.

Looks soft to me but who am I to decide?!

Borussia Dortmund are still controlling the game - they are knocking it around with real ease.

Rio Ngumoha is out warming up. Should imagine he'll be introduced in the second half and maybe Liverpool fans will get a glimpse of new signing Victor Munoz.

He's fresh off winning the World Cup with Spain, of course.