Finally Rams goalkeeper Kelle Roos is forced into action!

Lewis Grabban flicks Alex Mighten's cross towards the bottom corner but Roos gets across to tip it around the post.

How isn't it 2-0?!

The ball is cut back for sub Jack Stretton six yards out and his low effort is maybe going wide anyway but it hits Scott McKenna at any rate.

The Reds scramble the corner away.

Mick McCarthy has rung the changes and sent on James Collins and Rubin Colwill for Tom Sang and Leandro Bacuna.

Shortly afterwards we get our first flashpoint of the game and the melee results in cautions for Antoine Semenyo and Sean Morrison.

Just as I say that about Forest needing to make chances, Kamil Jozwiak cuts in and shoots just wide for the hosts.

So Forest have got two strikers up front now and they've got to create some chances for them.

The Reds have dominated possession this half but Rams goalkeeper Kelle Roos has scarcely been more than a spectator so far.

What a first half for Michael Smith and Rotherham in League One.

The striker doubled their lead and his tally for the afternoon just before the break in this South Yorkshire derby.

Doncaster look to be heading for a fourth loss in five games this season.

Michael Pearlman
BBC Sport Wales at the Cardiff City Stadium

Wow!

That's a moment of real quality for Andreas Weimann who meets Antoine Semenyo's cross with a firm volley that he absolutely slammed into the net.

A cliche, but that's a goal worthy of winning any game.

Quick bit of housekeeping.

Ravel Morrison was booked a moment ago after making a foul to try and stop the game so that Derby could make their sub. The referee played advantage at the time so it really didn't work out for Morrison at all.

The Reds make a tactical change as striker Lewis Grabban comes on for midfielder Ryan Yates.

Derby captain Tom Lawrence makes way, well he's been off the pitch for three or four minutes now, and Jack Stretton is on.

Lawrence's goal remains the difference between the two sides.

The first change of the afternoon sees Nigel Pearson send on Antoine Semenyo for Andy King.

The Wales international made that goal-line clearance to deny international team-mate Kieffer Moore in the first half.

Derby skipper Tom Lawrence isn't going to be able to continue.

He's just limped off and the hosts are briefly down to 10 men while they ready a sub.

Chances at both ends as these two side show no intention of slowing down the tempo.

First, Marlon Pack goes close for Cardiff before Bristol City's Andreas Weimann, with that bustling running style of his, forces Dillon Phillips into a save.

Without wanting to sound too agricultural I wonder if this is where Derby not having a striker on the pitch counts against them.

There's been a couple of times this half where you feel like they've looked for an option to put a ball in behind or just get the ball up and play for a second ball and they haven't been able to.

The Rams obviously have a very limited squad because of their transfer embargo and both their senior strikers Colin Kazim-Richards and Sam Baldock are out injured.

Thirty minutes to go.

Image source, Rex Features

Forest are enjoying the lion's share of possession now and the travelling supporters are in full voice backing their team.

They haven't started a league season with five successive defeats since 1954-55 and they've got just over 30 minutes to make sure that the crop of 2021-22 don't emulate that unwanted record.

A nervy moment for Daniel Bentley!

An in-swinging Cardiff cross is cut out by Zak Vyner but it loops up off the defender's boot and almost catches the goalkeeper out.

He gratefully clutches at the second attempt!

Michael Pearlman
BBC Sport Wales at the Cardiff City Stadium

I've already told you the mad stat that all eight of Cardiff City's goals in the Championship this season have come via headers.

Well, a Cardiff City fan just used his bonce, rather than his hands, to return a ball that had been booted into the crowd.

So even the fans are adopting this club policy of sticking your head on it.

Down the other end and Brennan Johnson races by Curtis Davies before cutting a low cross-shot past the far post.

That's the first time the Reds man has got isolated against a Derby defender and he beat him all ends up.

Michael Smith has just put the Millers in front in their South Yorkshire derby against Doncaster from close range.

27 minutes on the clock.

Image source, Rex Features