The final whistle goes.
There will be two added minutes.
Rosicky hammers in a shot from 25 yards but Cech blocks well then Giroud volleys widely over the bar.
Chelsea break quickly looking for number seven but Salah loses control and Sagna clears.
Free-kick on the left for Arsenal and a chance to get the ball into the Chelsea box. Similar story though and it is headed clear.
Salah's run on to a long through ball is mistimed by a fraction and the whistle goes for an offside.
Another good attempt from Schurrle on the edge of the Arsenal area is just wide of the upright.
Arsenal continue to give the ball away and Jenkinson at fault this time. Salah attempts to find Hazard on the edge of the area but his pass is blocked.
Lovely ball in from the right into a dangerous area by Ivanovic but Czszesny is down well to smother.
Nice delivery from the free-kick by Schurrle but Terry can't get his feet organised as the ball drops on the far post.
Sagna clumsy on Salah and Chelsea have the free-kick.
Cazorla almost gets on the end of a Sagna centre but Cahill and Cech manage to clear as the two Chelsea men collide.
Foul by Mikel on Flamini just inside the Chelsea half.
Some nice interplay from Arsenal as they head towards the Chelsea box but it is soon broken up by a cluster of Chelsea shirts.
Jody, a Barnsley FC fan says: "A few weeks ago Andre Marriner officiated Sheffield Wednesday v Barnsley. He had a nightmare. Sent three men off. Turned down two legitimate penalty appeals and then added three extra minutes onto the five given. It was all about him. He is a joke and today has proven that."
Luiz off and John Obi Mikel on.
GOAL SALAH: It is six of the best as Salah finishes coolly with his left foot under Szczesny after beating the offside trap and going one-on-one with the Arsenal goalkeeper.
Cazorla chips a ball over the top but no Arsenal front player in the area and Cech collects.
Luiz brings a good save out of Szczesny from just outside the box and the 'keeper does well to pounce on the ball again with Torres trying to poke it into the net.
That is it for Oscar and he is replaced by Mohamed Salah.
GOAL OSCAR: The Brazilian gets his second after he picks up on another Arsenal error and his low shot evades the dive of Szczesny.
Optimistic shot by Giroud from halfway as he spots Cech off his line.
Arteta takes the free-kick but Flamini can't get any power towards the Chelsea goal on his header from close range,
Flamini caught by Oscar and a free-kick to Arsenal.
Brilliant from Torres as he controls a high ball instantly, turns Sagna inside the area and the sets up Oscar. The Brazilian fires just over the bar.
Torres bursts clear but the whistle goes for offside.
Nice try from Cazorla from the left side of the Chelsea area but his effort is just wide of the far upright.
Better from Arsenal and a ball inside from Cazorla is intecepted by Matic on the edge of his own area. There is a cry for handball but the game is waved on.
Rosicky bursts forward with some intent but Azpilicueta steps in his way and makes a good challenge before clearing.
Woeful from Arteta as he chips the ball to the edge of the Chelsea area only to see it headed clear very easily.
Free-kick 35 yards from the Chelsea goal as Giroud goes down under pressure from Cahill.
Limp corner from Cazorla is cleared at the near post with ease.
Play is actually more in the Chelsea half at the moment until Cahill comes cross to the right flank and clears. Arsenal press again and win a corner on the left.
Arsenal move the ball from left to right but an attempted cross by Jenkinson is blocked.
Roscicky goes in the book for a clumsy challenge on Cesar Azpilicueta. The latter left limping and Rosicky does actually apologise.
Roland Jakobsson from Sweden says: "I can't believe it, yet another horror show from Mr Marriner at Stamford Bridge this season. I remember West Brom getting an official excuse after beting robbed with a dodgy penalty call, and this time he correctly awards the penalty but sends the wrong player off! Shocking stuff."
Deep pass to edge of the Arsenal area but Oscar can't win the header and the ball bounces through to Szczesny.
Torres looking super-confident as he dribbles into the Arsenal box. Great block from Per Mertesacker and then Szczesny saves a close-range shot from Luiz.
Deep ball from inside the Chelsea half but Schurrle's diagonal run finds him just offside.
Arsenal restart the game. Mathieu Flamini and Carl Jenkinson come on for Oxlade-Chamberlain and Koscielny.
Chris Green says: "The decision to send Gibbs off instead of AOC is mind-blowing and completely unacceptable. I hope the FA rescind the red card."
Sam Clements says: "City fan. The ref is a disgrace, he has ruined the game needs to be looked into by FA. Replay I reckon."
Many thanks to Ken Beeley: "Watching the page from Canada and sneaking upstairs at work to to watch in lunch room. It's amazing how managers and players are hauled up before the FA for comments made to the press, or for fouls, or anything that brings the game into disrepute. But despite this being a multi-million pound industry, referees are not compelled to explain themselves in public and the FA are not compelled to explain their shoddy processes. Terrible officiating, but it seems to be what we have come to expect from some of our so called Premier referees."
Idowu Anthony-Ajileye says: "Arsene Wenger should be blamed for this failure. He has refused to strengthen his attacking options. Giroud is not good enough to be Arsenal's main striker. The Premier league has moved on from the way Wenger sees it."
It is no offers Chelsea with Sky Bet but a half-time Price Boost has Chelsea to win 6-0 as a 5/1 chance. Eden Hazard to score next is 13/2.
Alan Sams says: "Before the start I said 3-1....and would have taken it!..call me greedy I want more!! Let's keep up the pressure blues goal average could matter come May."
"The team are letting Wenger down big time! Especially in the big games same happened at City and at Anfield! And how the referee can send off the wrong man is a joke - complete howler. Damage limitation now - our players need to show some grit and keep the score at 4," says Cahir McKenny.
Martin Willmin says: "Arsenal are very poor, but the referee is worse - if Arsenal were winning, Jose M would be ranting that AOC was still on the pitch. Match should be voided due to 'ineligable' player on pitch and referee never allowed to ref again!!"
The whistle goes for the break after a terrible first half for the Gunners.
Couple of late corners for Chelsea. Hazard hits a volley from just outside the Arsenal area which is blocked and then he dribbles into the box and his second effort is also thwarted.
Another awful officiating decision a clearance by Vermaelen clearly hits Torres and goes behind but Chelsea get a corner.
There will be three added minutes.
Late thrust from Cazorla and his pass finds Giroud on the left in the Chelsea box but the Frenchman fires into the side netting.
Shot from Oscar bounces off the shoulder of Laurent Koscielny as he attempts to get out of the way and fortunately for the Gunners loops into the arms of his 'keeper.
GOAL OSCAR: Nightmare for Arsenal as Chelsea break with too much pace again with Mikel Arteta left trailing - Torres found by Schurrle and the Spaniard centres for Oscar to fire high into the net from close range.
Ball breaks to Hazard just outside the Arsenal box but his effort under pressure is into the stands.
Ivanovic raids from right back into the Arsenal area buut just can't get control of the ball. Atrsenal goal-kick.
Deflected shot from Schurrle this time from distance and Szczesny is down to his right to make the save.
Sagar Singha sums things up nicely: "City fan! Whats going on here? The ref just ruined the match. He did not signal for the pen and has shown red to a wrong player! Never seen anything like this before."
Santi Cazorla tries a shot from the edge of the Chelsea area but it is blocked then Oxlade-Chamberlain has a go from similar range but slips and miss-kicks horribly.
Szczesny clears long from his own area and Luiz meets it well with a header on halfway.
Free-kick on the right side of the Arsenal area for Chelsea but it is too high for John Terry and headed clear by Sagna.
Two corners from Chelsea with the second caught comfortably by Szczesny.
Oxlade-Chamberlain loses the ball on halfway and Luiz surges forward. He hits his shot from the edge of the Arsenal area and Szczesny makes a great save after a deflection.
Tomas Rosicky goes down in the Chelsea area between Gary Cahill and Ivanovic but nothing given.
Offside decision against helsea gives Arsenal a free-kick in their own half.
Mistake at the back this time from Vermaelen lets Branislav Ivanovic in around the back but his cross from the byline is scrambled clear.
Report from the touchline and still a mystery as to why Gibbs rather than AOC went off.
Chelsea continue to hold the ball comfortably as Arsenal chase around and try and get some possession.
Tactical change for Arsenal now as Thomas Vermaelen comes on for Lukas Podolski.
It is a rather stunned Stamford Bridge at the moment. Chelsea have done what they have to early in the game so they just casually knock the ball around.
Chelsea break again and Torres feeds Schurrle but the latter trips over and the ball gets away from him.
Crazy scenes at Stamford Bridge. That is all I can say. Oxlade-Chamberlain tried to tell Andre Marriner that it was him who made the diving stop but the ref still sent Gibbs from the pitch.
GOAL HAZARD: No mistake from the spot by the Belgian.
Oxlade-Chamberlain gets a red card for his save on the goal line. Spot-kick to come. But hang on a minute, it is Gibbs who has gone down the tunnel!!!
Hazard almost makes it three and it is only kept out by the hand of Alex Oxlade-Chamberlain.
Arsenal offside and Cech takes the restart from just outside his own area.
Eden Hazard barged off the ball by Sagna and Chelsea have the free-kick just inside the Arsenal half. Schurrle takes but it loops straight into the arms of Szczesny.
Arsenal give the ball away yet again but this time the whistle goes for a foul by David Luiz.
Very sloppy again from Arsenal as Kieran Gibbs gives the ball away this time to Oscar. He manages to get back and make a tackle though before the Chelsea man can cross from the right.
Eto'o limps off and he is replaced by Fernando Torres.
Eto'o down on the ground and indicates he has a hamstring problem and may have to come off.
GOAL SCHURRLE: Chelsea double their lead as Nemanja Matic steals the ball on the halfway line, releases Schurrle, who does the rest as he charges to the edge of the Arsenal box and rifles a shot past Szczesny.
GOAL ETO'O: Chelsea break with pace as Andre Schurrle feeds the striker just inside the Arsenal box and he curls a left-foot effort delightfully into the far corner.
First chance for Arsenal as Olivier Giroud is found in the Chelsea box and his effort is palmed away by Petr Cech.
Early chance in the Arsenal box after an awful pass from Laurent Koscielny and Szczesny is off is line well to snuff out the danger as Samuel Eto'o goes tumbling over the 'keeper.
Neat and tidy early possession for Arsenal in the Chelsea half and an attempted deep cross from the right by Bacary Sagna is blocked.
Long ball down the right flank early from Chelsea goes out for an Arsenal throw. The ball ends back with Wojciech Szczesny for an early touch.
Chelsea get the game started.
The teams have emerged on a sunny afternoon in west London.
Thanks to Alan Sams: "Firstly, and I'm a blues fan, hats off to Arsene Wenger, he deserves more than Arsenal board have given him, enough of this soft stuff though today I think will finish Arsenal's title hopes, think we will be too strong and end up 3-1 winners."
"Well done wenger 1000 games in charge. Hopefully Chelsea won't ruin the game like the last time we played in the league. If they try and play us I think we will win 1-2. Come on you gunners," says Renato Fusciardi.
Team news: Arsene Wenger takes charge of Arsenal for the 1,000th time against Barclays Premier League leaders Chelsea at Stamford Bridge. The Frenchman - chasing a first victory over Jose Mourinho's Chelsea at the 11th attempt - names an unchanged side following last week's win over Tottenham with Kim Kallstrom among the substitutes. Mourinho, who last month called Wenger "a specialist in failure'', referring to his eight-year trophy drought, makes three changes following Tuesday's defeat of Galatasaray, two enforced due to suspensions of Ramires and Willian after their dismissals at Aston Villa. David Luiz, Andre Schurrle and Nemanja Matic come in, with Frank Lampard the third player to miss out as he drops to the bench.
Hello to Olly From Blackwater: "Feelin confident bout today,3-0 Chelsea with a hat trick from old man Eto'o.come on Chels!!!"
Ian Potter says: "4-1 to Chelsea, Arsenal to score first though!........."
Hello to Michael Dingle: "Arsene Wenger hasn't got a chance today. It will be a 1000th game in charge to remember, but not in a good way! 3-0 Chelsea with Hazard running the show. COYB!"
"Expecting a closely fought game, with Chelsea prevailing 2-1." Henry (Singapore)
Arsenal: Szczesny, Sagna, Mertesacker, Koscielny, Gibbs, Arteta, Oxlade-Chamberlain, Rosicky, Cazorla, Podolski, Giroud. Subs: Vermaelen, Flamini, Fabianski, Sanogo, Jenkinson, Kallstrom, Gnabry.
Chelsea: Cech, Ivanovic, Cahill, Terry, Azpilicueta, Luiz, Matic, Schurrle, Oscar, Hazard, Eto'o. Subs: Lampard, Torres, Mikel, Salah, Ba, Schwarzer, Kalas.
Hello to Cian Hughes: "Hi! Good Afternoon! Tough game today! I'd first like to say congratulations to Wenger on his 1000th game! Tough one to predict! I'd like Wenger to get a win or a point just because of his 1000th game. I can honestly see Arsenal nicking a draw. 2-2. Hazard and Terry for Chelsea and Cazorla and Giroud for Arsenal."
Thanks to Cesc Henry: "Possibly the biggest game of the season, as much as I want Arsenal to win as a gooner! But I can't see past a 2-0 Chelsea victory with Hazard grabbing a brace. "
Hi to Toby: "Hi, CHESLEA to win 3-1 today with ETO'O, OSCAR and SHÜRLLE to score! COME ON BLUES!!!"
It would not be a clockwatch without Chris Green from Huddersfield: "Arsenal to win 3-2, with Rosicky, Cazorla and Giroud scoring the goals."
Hello to Anish Parekh: arsenal 2-1 victory. Giroud and podolski getting the goals congrats to wenger for his 1000 game COYG."
It is Arsene Wenger's 1000th game in charge of Arsenal - welcome along to our coverage as they take on Chelsea at Stamford Bridge. Slightly late on parade but drop me a line at firstname.lastname@example.org with your thoughts on the match.