Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

This is what we've been talking about all first half. Donegal are open at the back when you run at them in twos and threes off the shoulder.

Just like that, Donegal have a six-point lead after a Patrick McBrearty free and O Baoill's second two-pointer.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

They (Derry) are slowing the kick-out down, playing into the breeze, but the problem is there is no movement.

A Shane McGuigan free - after Hugh McFadden touches the ball on the ground - briefly brings Derry level but Peadar Mogan swiftly restores Donegal's slender margin.

And in an example of the new rules, Brendan Cawley brings a Derry free all the way up the field after Daire O Baoill fails to hand the ball back for the free.

Seems a harsh penalty for such a minor infringement, but this is where we're at.

McGuigan knocks over the free, but moments later, O Baoill swings over a two-pointer. That would have been just the one point last year!

And after Brendan Rogers interferes with a Donegal tap and go, Cawley brings another free forward and Michael Murphy is able to tap over his first championship point in three years.

John Haughey
BBC Sport NI at MacCumhaill Park

Derry are clearly chasing goals here in Ballybofey rather than taking their point. But unfortunately for the Oak Leafers, the gamble of going for the major hasn't paid off so far.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

We mentioned at the start of the game that Donegal's bench was strong and they made those changes offensively, but defensively they have been poor when facing the ball.

Lovely point from Niall Toner brings Derry back to within one.

A few minutes before that, Donegal nearly had a goal when Neil McNicholl - seemingly unsighted by the sun - spilled Michael Murphy's shot. Derry managed to scramble clear and McNicholl asked for a cap to shield his eyes.

Shane McGuigan had two bites at it but still couldn't get past Shaun Patton.

Conor Doherty somehow manages to wade his way through a sea of Donegal bodies. He loses control of the ball and still manages to poke the ball towards goal, but it goes wide.

Another let-off for Donegal.

Donegal lead by two.

Shane O'Donnell kicks over the bar to make it 0-3 to 0-1, and while Lachlan Murray brings Derry back to within, Ciaran Moore whips over a lovely score.

Good start to this one.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

Derry are causing hassle when they run off the shoulder and be direct.

Donegal need to get Murphy on the ball a little bit more. I think he's only touched it once around the middle.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

The penalty he seemed to scuff the top of the ball, but the rebound fell to his (Shane McGuigan's) right foot. He just had to hit and it's going into the goal, but Patton does excellent.

Incredible! Shaun Patton saves Shane McGuigan's low drive from the penalty and gets up to smother the rebound too!

Huge moment 10 minutes in.

Patton injured his shoulder in the process. We'll keep an eye on that.

Image source, Getty Images

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

That's one of those moments where the energy can change in a game. It could have been with Derry, but let's see what happens now.

Derry have a penalty after Shane McGuigan is felled by Hugh McFadden!

Ethan Doherty clatters the post with a shot after Derry turn the ball over.

And in the blink of an eye, Conor O'Donnell and Ryan McHugh edge Donegal ahead.

McHugh found himself in space in behind Derry's full-back line and could have gone for goal, but chose the point.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

When Patton goes for the long kick-out, you see Rogers sweeping in behind to get on the ball.

Derry are slowing down the game, keeping momentum which is going to be key for them.

Derry seeing plenty of the ball early doors and the opening score of this year's Ulster series is scored by Padraig McGrogan. Good to see the Newbridge man back in championship action after his ACL injury last year.

Padraig Cassidy's shot a minute later, however, goes wide.