|Sebastian Larsson (Damien Johnson, 88)|
|James McFadden (Keith Fahey, 78)|
|Rodrigo da Costa Alex|
|Frank Lampard (Joe Cole, 79)|
|John Obi Mikel (Michael Ballack, 85)|
|Daniel Sturridge (Salomon Kalou, 67)|
Full time at St Andrews and Chelsea miss the chance to go 7 points clear while Birmingham's excellent recent run continues.
There are to be six minutes of time added on, yes SIX!
Florent Malouda receives his second yellow card for a late challenge and Chelsea will have to end the game with ten-men.
Damien Johnson makes his first appearance of the season, replacing Sebastian Larsson.
Hart is ok to carry on, complete with white bandage round his head.
Hart is still recieving treatment as Mikel comes off for Michael Ballack.
Brave goal-keeping by Joe Hart, Stephen Carr's back header is a touch short and with Kalou looming Hart does well to claim the ball, getting a cut on his head for his troubles.
Another sub for Chelsea as Joe Cole comes on for Frank Lampard.
Branislav Ivanovic is booked for a cyncial challenge on Liam Ridgewell.
Change for Birmingham as James McFadden makes way for Keith Fahey.
Malouda breaks into the box and shapes to shoot only to be tackled by his own player Didier Drogba!
Hart is at it again. Belletti fed Kalou who curled in a shot that was well tipped wide by Hart, then from the resulting corner the on-loan 'keeper did well to save from Lampard.
Bowyer is booked for late challenge during the last Chelsea attack.
That should have been a goal. Kalou again does well down the right and his chipped cross is met by Malouda 8 yards out but he completely slices the ball and it goes wide.
Kalou is in the action immediately, breaking free down the left and his deflected cross is met by Lampard whose effort goes well over.
Daniel Sturridge 's first Premier League start is over as Salomon Kalou comes on to replace him.
Cech recovered from his collision with the post to see Birmingham's corner cleared by Drogba.
Great save! Larsson's curling free kick looked to be going in but Petr Cech stretched across to tip the ball wide - colliding with the post in the process.
Malouda goes into the book.
Joe Cole is warming up on the touchline, he may have to be introduced if Chelsea are to break the deadlock in this one.
Ashley Cole's shot is well blocked and from the resutling corner Alex is completely unmarked but his header is cleared by Ridgewell - poor marking by Birmingham.
The game has continued at the same frantic pace, no chances so far though.
Were underway again at St Andrews.
The half-time whistle goes and somehow it is still goalless - more of the same in the second half please!
Another chance for Chelsea as Daniel Sturridge somehow puts the ball wide from 3 yards!
What an effort! Alex strikes a swerving free-kick from fully 30 yards that thumps off the crossbar - I think it's still shaking!
This game has come to life now! Jerome appears to be fouled by Belletii, however referee Peter Walton overrules the linesman's decision - much to the home fans frustration!
Birmingham are back in this game now as Ridgewell has a header just over the bar.
Chaos in the Chelsea box! Didier Drogba lies injured on the turf as Liam Ridgwell's shot is deflected in by Benitez. The linesman's flag denies him again, though replays show the injured Drogba playing Benitez onside!
Joe Hart does it again! Lampard fires in a volley only for Hart to tip over from point blank range, brillant stop from the England 'keeper, Lampard can't believe it.
Close call! Benitez finds himself clean through only for the offside flag to deny him - replays though suggest he might have been onside.
What a save! Florent Malouda and Ashley Cole combine to set up Daniel Sturridge, whose goal bound shot is tipped wide by Joe Hart. It looked in all the way.
The same match pattern continues - Chelsea dominating the ball but Birmingham closing them down at every opportunity and restricting them to long range efforts.
Frank Lampard makes space for himself but his 25 yard effort goes miles over.
Sebastian Larsson goes for goal but it whacks off the Chelsea wall and away.
Great play from Christian Benitez as his quick feet evades two Chelsea defenders before he is brought down for a free-kick to Birmingham 25 yards out.
Chance for Chelsea! Ivanovic meets Lampard's corner but his header flashes just over the bar.
It's all Chelsea so far, though they have only managed the one shot at goal for their efforts.
Branislav Ivanovic has an ambitous effort from 25 yards, but it goes well wide of Joe Hart's goal.
Chelsea have dominated the early possession despite the eager Birmingham players snapping at their heels.
Chance for Birmingham! Cameron Jerome latches onto a Sebastian Larsson pass, outpaces Alex, but can only shoot into the crowd.
Referee Peter Walton gets the first game of a busy Boxing Day programme underway at a sunny St Andrews.
Chelsea meanwhile make 4 changes with Alex, Belletti, Mikel and Sturridge in for Carvalho, Cole, Ballack and Kalou.
Birmingham remain unchanged for the 7th game in succession as they look to continue their impressive run of form against the league leaders.
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