Let's remind ourselves what that victory means for Arsenal...

Phil McNulty
BBC Sport chief football writer

Big win for The Gunners and fully deserved despite Man City's late rally. Optimism growing at the Emirates.  

Liz, I'm sure you remember, slighted Yaya just minutes before he popped in that worldy.

Kelly Cates
Sports Presenter

"You get a real sense from the fans around us here that they believe that Arsenal can win the league this season. Is this their best chance in 10 years?"

Image source, Getty Images

Danny Mills
Former Man City defender

"Yaya Toure's goal came from nowhere. City dominated possession but only had long shots as Arsenal played perfect counter-attacking football.

"Arsenal had really good chances to kill the game off and got nervous at the end but you have to say all credit to them. It was a terribly disappointing performance from City."

Arsenal's players celebrate - Olivier Giroud high-fiving Petr Cech.

The Frenchman is strutting about with a ripped shirt. It's not quite Terry Butcher-esque, but he put his body on the line when he wiped out Nicolas Otamendi late on.

Yaya Toure steamed into the party late and threatened to ruin it for Arsene's boys, but they somehow managed to bundle him out of the back door before he could do any lasting damage.

Arsenal win. Just about.

Image source, Getty Images

Yaya Toure is desperate to haul Manchester City back into this, giving away a free-kick for dragging Calum Chambers to the ground.

It's like he's finally woken up, discovered a burglar in his living room and he is throwing haymakers left, right and centre.

Danny Mills
Former Man City defender

"It was a good strong challenge from Olivier Giroud! Hopefully it's nothing too serious an injury but everyone is taking their time."

Concern for Arsenal as Olivier Giroud rolls around in discomfort after tangling with Nicolas Otamendi in the penalty area. City wanted a penalty. It was a firm challenge, that's for sure.

Yaya's goal reminds me of when you play football with your dad. You laugh at how unfit he looks (Yaya is not unfit, mind)... then he pings one into the top corner and offers a little wink which says 'I've still got it you know'.

Image source, AFP

Luke Reddy
BBC Sport in the Match of the Day edit suite

Image source, BBC Sport

Manchester City's defending has prompted a few head in hands moments for our pundits tonight.

There's praise now though. "They're battling well now City," says Phil Neville.

Yaya Toure surges into the Arsenal box like only Yaya Toure knows how to, but the big man pokes wide under pressure from a panicked centre-half. Admit it, Gunners. You're worried now.

Phil McNulty
BBC Sport chief football writer

"Suddenly Manchester City manager Manuel Pellegrini is pacing his technical area in anticipation and Arsenal's fans are living on their nerves. 

"If City get a point they will have barely deserved it - but now they have a lifeline."

Don't rule out Manchester City nicking a point here. Jesus Navas drills in a low cross which is put behind for a corner. The centre which follows eventually finds Wilfried Bony who puts the ball over the bar.

Luke Reddy
BBC Sport in the Match of the Day edit suite

"That is nonchalant , that is nonchalant," says Martin Keown as Yaya Toure scores a sumptuous goal.

As the replays roll both Keown and Phil Neville are intently gazing at the screens to ascertain the root of the Arsenal problem.

"Flamini has to come out quicker to him," Keown concludes.

Image source, Reuters

It's happening at both ends now. Moments after Arsenal go close at one end, Wilfried Bony drags a shot wide at the other.

Danny Mills
Former Man City defender on 5 live

"Another fabulous strike! Toure just opens up his left foot and passes it into the top corner. He just felt it in. It's a brilliant finish!

"If Arsenal don't win this game they will rue some missed chances. They should have put this game beyond City but City are back in it now."