45'
The teams are back out at Stamford Bridge...
45'
KICK OFF Chelsea start the second half.
46'
Clichy striding forward after playing a neat one-two with Wilshere. His cross is deep, looking for Chamakh and Cech makes an easy catch.
47'
Arsenal need to try and get Arshavin and Nasri involved, they have looked like their mostly likely route to a goal.
48'
Drogba breaks after Nasri loses possession, Song is forced to bring him down and Chelsea have the first set piece of the second half.
49'
The man who committed the foul, Song, heads it clear. Ramires brings down Wilshere as Arsenal look to come forward.
50'
Arsenal take the free kick short and earn a first corner of the second half.
51'
Chamakh rises highest and aims a header towards goal which is narrowly wide.
52'
Corner to Chelsea, Ramires find Malouda brilliantly, the Frenchman's cross is turned behind...
52'
Safe hands from Fabianski as he takes the cross.
53'
Straight up the other end and Arsenal have a corner, conceded by the improving Ramires.
53'
Yet another wasted corner for the Gunners. Hardly suprising given the height difference between the two teams.
54'
Abou Diaby is in for a moment after being found by Arshavin, his first touch is poor and Arsenal have to make do with a corner. Needless to say the corner is easily cleared by Chelsea.
55'
From the cleared corner Wilshere advances, Diaby again with the ball, he manages to get a shot off which takes a huge deflection and goes out for a corner.
56'
No danger from the corner. I don't see why Arsenal even bother taking them.
57'
Chelsea on the front foot this time, Drogba plucking the ball out of the sky and running at Koscielny. The summer signing does excellently, his sliding tackle giving away a corner.
58'
Fabianski claims the corner and starts a counter attack. Arshavin whips in a dangerous ball which almost falls for Wilshere, the youngster dispossesses Cech a finds Chamakh. The Moroccan cuts inside and looks to shoot, but Ramires flies in with a cracking challenge.
59'
Anelka misses an open goal! Woeful defending from Squillaci, facing his own goal he fails to control a bouncing ball, allowing the Frenchman in. He rounds Fabianski and all he has to do is roll it into the empty net. He can't and finds the side netting.
61'
Arsene Wenger must be considering changes, Vela or Rosicky? I'm not sure what difference either of those would make.
62'
Arshavin bundled over by Ramires, Arsenal free kick near the corner flag.
63'
Mikel heads the free kick clear as far as Clichy, who tries an outrageous shot from 30 yards which was never troubling Cech.
64'
Nasri has looked the liveliest of Arsenal's attackers, this time he comes within inches a slipping Chamakh in behind Chelsea. It's all Arsenal at the moment.
65'
Great play from Ramires and then Essien as the Ghanaian breaks. He releases Anelka, whose cross is over hit and misses Drogba.
66'
Chelsea enjoying a spell of possession for the first time in the half. They will just be trying to ease some of the pressure on their defence.
67'
Drogba trips Song, free kick to Arsenal just inside the Chelsea half.
68'
Arsenal were looking for a penalty as Chamakh goes down very theatrically. Never a penalty.
69'
Ashley Cole hammers the ball into the net emphatically! But it won't count, he was in an offside position when he was found by Anelka.
70'
 Tomas Rosicky on for Abou Diaby
71'
Rosicky earns a corner for Arsenal with his first touch...
71'
Chamakh rises to meet the corner, he looks to nod it down for Wilshere but Chelsea clear.
72'
Alex Song tries his luck from distance after nice approach play from Arsenal, it's sliced though and flies wide.
73'
 Paulo Ferreira on for Branislav Ivanovic
74'
Rosicky involved again, a lovely lay-off from Nasri finds him in space and he curls a low effort into the arms of his compatriot Petr Cech.
75'
Fabianski makes an awkward looking save from a Drogba effort, at least he kept it out!
76'
Chelsea have a free kick after Drogba tangled with Squillaci...
77'
Chamakh heads clear at the back post and Arsenal push forward.
78'
All through the second half the story has been the same, Arsenal seeing plenty of the possession but creating no real chances or troubling Petr Cech.
79'
 Paulo Ferreira carded for intentionally felling Rosicky as he broke.
80'
So close for Arsenal! Rosicky whips a wonderful cross in towards goal, Chamakh meets it and sees his header bounce marginally wide.
81'
 Jay Emmanuel-Thomas on for Jack Wilshere
81'
A Premier League debut for Emmanuel-Thomas, his presence forcing Ferreira into conceding a corner.
82'
Chelsea clear the corner and Ramires streaks away with Anelka. The Frenchman plays him through on goal but he is marginally offside.
83'
 Yuri Zhirkov on for Ramires
84'
 Koscielny carded for a crude trip on Anelka as the Frenchman looks to get away. A very dangerous free kick...
85'
 GOAL A stunning goal from Alex!!! Everyone was waiting for Drogba to hit the free kick, but Alex strode forward and leathered past a helpless Fabianski! An unbelievably powerful strike! Chelsea have sealed their win now.
86'
Essien is through on goal again as Arsenal fall apart. With so much time, Essien fails to make a decision and in the end hits a feeble poke at Fabianski.
87'
 Carlos Vela on for Andriy Arshavin
88'
 Danny Sturridge on for John Obi Mikel
89'
The Chelsea fans are in triumphant mood, their team have a four-point cushion at the top of the table.
89'
Ashley Cole with a thunderbolt of his own, Fabianski palming it away!
90'
THREE MINUTES ADDED TIME
91'
A worrying sign for Chelsea, Alex is down clutching his thigh and is now being helped off the field.
92'
Chelsea's defence has been formidible this season, they'll be hoping Alex isn't badly hurt.
93'
FULL TIME Chelsea with another win over Arsenal, they are looking like the team to beat once again.
93'
Arsenal have once again seen a game in which they had plenty of possession turn into a defeat, Arsene Wenger's team looked toothless today.