1'
Arsenal get us started and there's an early foul n Didier Drogba.
1'
A lovely exchange between Lampad, Malouda and Drogba early on led to that foul.
2'
Kalou takes down Koscielny and Arsenal have a free-kick down the left.
2'
The Gunners play it short and it's switched to the right where Walcott looks to take on Cole.
2'
Sagna's cross headed clear by Ferreira.
3'
Song and Wilshere combine but Lampard is back in to intercept.
3'
Fantastic atmosphere at the Emirates, it's sounding noisy in north London.
4'
Fabregas turns and plays a through ball to Van Persie, but the Dutchman is ruled offside.
4'
This is Arsenal's biggest game of the season. If they can overcome their Drogba problem, then they will make a real statement about how far they can go in the title race.
5'
Kalou and Essien combine well down the right after Fabregas was caught in posession. poor cross from Kalou though, with Lampard Drogba and Malouda waiting.
6'
Lovely ball from Song over the top to Van Persie, but the striker missed his kick completely after getting round the back of Ivanovic.
7'
Chelsea now surge towards the Arsenal goal in numbers but the Gunners hold their defensive position and the ball is given away by Terry.
7'
Drogba tries his luck after breaking against Koscielny but his effort is dragged wide from 18 yards out.
8'
Great pace from nNsri to leave Ferreira in his wake down the left wing, but his cross is collected by Cech.
8'
Another lovely tuen from Nasri who exchanges with Fabregas to release Sagna. Fizzing cross from the Arsenal right-back but it's cleared away.
9'
Chelsea back down the other end now as Kalou looks to take on Clichy.
9'
Malouda comes to the right and tiptoes into some space to win a Chelsea corner.
10'
Van Persie heads it away.
10'
Malouda searches for Drogba with the cross from the right, but it's harmlessly into Fabianski's hands.
11'
Arsenal again looking for Van Persie over the top - does Wenger believe that playing the long ball may be the key to unlocking Chelsea?!
11'
It's been real end-to-end stuff so far, the game has had a fantastic pace to it.
12'
Terry loses possession in midfield and cynically fouls Van Persie. It's an Arsenal free-kick as referee Clattenburg warns Terry not to do it again.
13'
Stats: Chelsea have scored 11 goals in their last four league games against the Gunners, conceding only once. It is 290 minutes (four hours and 50 minutes) since Nicklas Bendtner scored Arsenal's last goal in the league against the Blues.
14'
Song feeds Van Persie and the ball breaks to Clichy on the left. The left-back cuts inside and scuffs a right-footed shot wide.
14'
Malouda crosses towards Drogba but Djourou heads it out for a corner with the Ivorian in close attendance.
15'
The corner is cleared and a free-kick is given against Mikel.
16'
Malouda penalised for pulling down Sagna and Van Persie looks set to whip in a cross from the right.
17'
It sails all the way through and Djourou goes to ground under a challenge from Terry...
17'
Clattenburg shakes his head. No penalty.
18'
Cole with a clattering challenge on Walcott. It's fair but the subsequent challenge on Malouda by Song isn't.
19'
Lampard escapes the clutches pf Song with one of his textbook ghosting runs, but Djourou stands is ground and blocks the Chelsea midfielder's advances.
20'
Van Persie peels off to the right where he is picked out by Fabregas. He tumbles under the challenge of Malouda on the edge of the area but Clattenburg says no again. Just a tangle of legs.
21'
Arsenal free-kick now from 30 yards out.
21'
Nasri smashes one but Cech holds onto the ball.
22'
Malouda brought down by Clichy and Chelsea have a free-kick down the left wing.
22'
Koscielny rises highest to head it away and Ivanovic is ofside when lampard attempts to loft the ball back in.
22'
Clichy is definitely the weak link for Arsenal at the moment.
23'
Walcott falls down with Ivanovic close to him, but the referee's whistle signals an offisde decision rather than a foul.
23'
Malouda ruled offside as he is released in acres of space down the left.
24'
Arsenal just a little too intricate on the edge of the Chelsea box and the visitors break down the move.
25'
Walcott sprints away but he takes a clumsy touch as he advances into the area and Terry can tidy up.
26'
Stats: Chelsea's return of six points from their last seven games is the club's worst run since 1998, when they finished fourth.
26'
Clichy does really well to dispossess Mikel but the Gunners can't capitalise.
27'
The boos ring out for Cole but the cheers begin as he gives it away.
27'
Fabregas loks for Van Persie but Terry is well positioned and intercepts.
28'
 Cole
28'
Sagna found Walcott, who drew the foul in the corner.
28'
Van Persie's free-kick is cleared but it's another for the Gunners from the left this time.
29'
Fabregas' delivery is held by Cech.
29'
The noise levels really rising at the Emirates.
29'
Cech looks long for Drogba for the third time in the past five minutes but the hoof upfield just gives Arsenal the ball back once more.
30'
stats: Arsenal's record in their last 11 games in all competitions against Manchester United and Chelsea is one draw and 10 defeats, with five goals scored and 23 conceded.
30'
Mikel looks long for Kalou who nods it down to Drogba in space 20 yards out...
31'
But Koscielny produces a great tackle.
32'
Nasri and Song keeping possession as Arsenal probe.
32'
The ball comes towards Van Persie who can't quite get the ball under control.
33'
 Van Persie.
33'
He launched into a tackle on Mikel, leaving the Nigerian in clear discomfort.
34'
There was a lovely pirouette by Fabregas in that last Arsenal build-up - great skill from the Gunners captain.
35'
Fantastic interplay from Arsenal, Fabregas plays it to Van Persie, who plays a one-two with Nasri on the edge of the box before blasting his shot high over the bar.
36'
Wilshere picks Drogba's pocket in midfield and the striker brings him down.
36'
Ancelotti sporting some fetching bright blue gloves and barking instructions from the touchline.
37'
Chelsea seem to be looking long wherever possible at the moment - it seems like a strange tactic when they've got so many excellent ball-players in their team.
38'
Walcott turns on the burners to get into the area, but his powerful cross is headed away by Terry.
38'
 Kalou
38'
Clichy cleared the ball in mid-air and Kalou's high challenge left him on the deck.
39'
Walcott bursts into life again, getting beyond Terry on the byline but not quite picking anyone out. Arsenal corner.
40'
Chelsea are beaking at pace now though. Terrible ball from Essien.
40'
Now Arsenal come back with Nasri and Sagna is in space.
41'
Fabulous save from Cech!
41'
Nasri's delicious chip from the edge of the box was turned over the bar as it looked to be dipping in.
41'
Superb from the Chelsea goalkeeper and he rises to collect the subsequent corner oo.
42'
Stats: Arsenal have not conceded a goal in the opening 25 minutes of a match this season.
43'
Mikel looks long but again Chelsea just giving the ball back to the grateful Gunners, who have dominated possession.
43'
Essien penalised for a challenge on Fabregas in midfield.
44'
 GOAL Song
44'
Arsenal 1-0 Chelsea. Song began the move, exchanged with Wilshere on the edge of the box before stealing the ball off Fabregas' foot and sliding it home with his left foot from ten yards out.
45'
A deserved lead for the Gunners on the balance of things.
45'
Chelsea with time for a free-kick just before the interval.
45'
Koscielny heads it out for a corner.
45'
Lampard delivers and there's cries of a handball in the box somewhere, but Clattenburg blows up for half-time.
45'
Half-time: ARSENAL 1-0 CHELSEA. The Gunners have shown more attacking intent and have been rewarded for their verve and gusto going forward, which has been stark contrast to Chelsea's frequent long balls. Drogba has been feeding on scraps.
45'
HT: The football is just incessant at the moment folks and tomorrow (Tuesday) sees another round of Premier League games. Check out the latest team news here.
45'
HT: Comment from ESPNsoccernet's Jon Carter: Arsenal have been the more attacking side and have, so far, managed to keep Didier Drogba quiet at the other end of the pitch. Relief is the over-riding feeling for most Arsenal fans.
45'
HT: I'm not sure what the answer will be for Chelsea but I'd say that keeping the ball on the ground would be a good start. Ashley Cole and Paulo Ferreira have rarely been out of their own half, while Essien and Lampard have been anonymous.