90+5 The corner is cleared, and the final whistle blows. Chelsea show their resilience to claim a point against an Arsenal side some way short of their best. It's a result that keeps the race for third as well as fourth very much alive.
One last Chelsea break, then, and Sturridge wins a corner.
Shooting chance for Gervinho, but three men in blue throw themselve in its path and make the block.
Torres scuffs a cross straight into Szczesny's arms. Chance for one last Arsenal attack.
Mata flagged offside as Chelsea try to break.
The corner comes to nothing.
A minimum of four minutes to add here. We start the first of them with an Arsenal corner.
Van Persie's sliderule pass for Santos is cut out, and Mata is then almost played through for Chelsea. Szczesny has to come out of his area to clear, and Sturridge tries to whack the ball straight back past him and makes a right mess of it.
Szczesny punches the corner clear. Both teams now prepared to gamble slightly for a winner.
Great recovering challenge from Koscielny to get the ball behind for a corner just as Sturridge prepared to pull the trigger.
Van Persie gets his head to the corner but heads straight to Cech.
Gervinho leads a fine Arsenal break before laying the ball off to van Persie who cuts inside and then back outside before failing to lift his shot over the advancing Cech. Corner to Arsenal.
Time running out in a cagey, tight game of few chances. Will it be a mistake or a moment of brilliance that settles things?
Mata looks to dink the ball through for Torres, but overhits the ball and allows Vermaelen to easily shepherd it out of play.
A defensive slip from Terry lets in van Persie, who slices horribly wide with his right foot. Might've been a different story on his left, but even with the weaker foot van Persie really should've done better.
Sturridge guilty of holding on to the ball for too long when he had team-mates well-placed. Arsenal eventually crowd him out and the chance is gone.
81 Silly booking for Cole, who is dispossessed by Song and then aims a sly kick at the Arsenal man.
Penalty appeals from Arsenal as van Persie goes down under Cahill's challenge as they compete for Song's cross. Dean shakes his head, and there are few complaints from the Dutchman.
Van Persie tries to play a one-two with Gibbs, but the left-back's return pass is far too weighty.
Malouda tries to find Torres with the outside of his foot, but Vermaelen is on hand to mop up. Fair to say defences have generally been on top in this one.
77 Boos echo around the Emirates as Ashley Cole replaces Bertrand.
76 Diaby booked for a foul on Essien in midfield. Clumsy.
The free-kick is squared to Essien, whose shot deflects into the path of Mata. He tucks the ball into the bottom corner, but is denied by the linesman's flag.
Sagna penalised for climbing on Torres. Free-kick for Chelsea out on their left.
74 Juan Mata replaces Kalou.
The magic number's 18, by the way.
STAT: Chelsea have conceded more goals in the last 15 minutes of Premier League matches this season than any other side.
72 Bosingwa enters the referee's notebook for a mistimed, late challenge on Santos.
Arsenal buzzing around the Chelsea box. Home fans trying to encourage their team forward. But the Chelsea backline is well organised and repels the Gunners' advance without much trouble.
70 Oxlade-Chamberlain, who made a couple of promising runs in the first half but has done little since the break, makes way for Andre Santos as Arsenal make their final change.
Kalou turns smartly to open up a promising position for Chelsea, and promptly gives the ball away.
Van Persie attempts a volley with an extremely high difficulty tariff. With most players you'd say that was an ambitious, optimistic effort, but van Persie's technique on those is so good you're surprised to see him slice it like a normal person as he does on this occasion.
Kalou does well to feed Sturridge on the right-hand corner of the penalty box, but the Chelsea striker's attempt to bend the ball beyond Szczesny is scuppered by a deflection that takes all the sting out of the shot and makes things easy for the keeper.
66 Oriol Romeu makes way after an anonymous 66 minutes to be replaced by John Obi Mikel. Chelsea certainly not short of options from the bench this afternoon.
64 Second change for Arsenal as Rosicky makes way for Abou Diaby.
Van Persie fires the free-kick high over the bar.
Cahill clumsily gives away a free-kick in a shooting position as he trips Van Persie.
Gervinho's first involvement takes him into the penalty area via a neat one-two with Van Persie before being harshly pulled up for a foul on Bertrand.
Promising situation for Chelsea, but Kalou badly overhits a throughball for Sturridge when he actually had quite a bit of space to work with.
Gervinho has taken up Walcott's station on the right flank.
61 Gervinho - who was being readied anyway to replace Oxlade-Chamberlain - replaces Walcott who is now gingerly making his way down the touchline.
Walcott's back on the field but, after attempting a run down the right wing, is back on the ground in agony and this time will have to make way. May regret trying to play on there.
Oxlade-Chamberlain underhits his corner and then, presented with a second chance to cross when the ball comes back to him, overhits the ball and sends it straight out for a goal-kick.
Neat play from Arsenal wins a corner.
Rosicky sets van Persie away as the Dutchman times his run perfectly, but he struggles to get the ball under full control and is eventually forced to try something from a tight angle and can't get the ball past Cech at the near post.
Essien overhits a return pass for Bosingwa, and the ball runs out for an Arsenal goal-kick. Walcott going through some stretches on the touchline.
Walcott hobbling off holding his left hamstring just below the backside. Not sure he'll continue, but the match now will.
Looks like he might have just tweaked a hamstring when looking to change direction.
Walcott down injured. Not sure what happened.
55 The flurry of yellow cards continues as Cahill is cautioned for a clumsy challenge on Oxlade-Chamberlain.
Good spell this for Chelsea as first Kalou and then Torres are denied by last-ditch tackles.
Szczesny off his line smartly to prevent Kalou getting on the end of Malouda's clever pass.
The corner comes to nothing.
A smart turn from Torres initially gets him away from Sagna and Koscielny, but the latter recovers to get a foot in and halt the attack at the expense of a corner.
50 This yellow card not so well received by Van Persie, whose free-kick is poor but not quite as bad as his challenge on Essien as Chelsea look to break. RVP becomes the third man cautioned today.
49 Van Persie's forward run is rudely halted by Malouda, who earns a caution for his troubles. Van Persie furious with the challenge, but seemingly placated by the sight of the yellow card.
Essien cuts in from the right and gets his shot away, but it's blocked and Sagna manages to prevent a corner and hack the ball clear.
Chelsea break through Torres, who manages to find room to dig out a cross. But there's little support in the penalty area and Arsenal clear.
Arsenal start the second half on the front foot.
Chelsea get the second half under way.
45+2 And that's the last action of a first half where Arsenal have been denied twice by the woodwork, while van Persie will feel he should've done better with a late chance. Chelsea have had their moments as well, though.
Bosingwa slices a clearance, but is spared by the offside flag as Walcott looks to cash in.
Great one-touch football from Arsenal as they turn defence into attack in the blink of an eye. Walcott's pass sets Oxlade-Chamberlain away, but he's dispossessed as he tries to cut inside.
The corner comes to nothing as we approach a couple of added minutes at the end of a first half that has burst into life in the last five minutes.
Bertrand deflects Sagna's cross behind for an Arsenal corner.
Another glorious chance! End-to-end stuff at the moment as Arsenal break and van Persie has a clear sight of goal from the inside-left channel after being found by Song but shoots straight at Cech when he should've given the keeper no chance. Cech makes the block and the score remains goalless.
Terry meets Malouda's corner but heads wide of the target. Decent chance as well.
Chelsea break and win a corner.
Chance! Serious questions to ask about the Chelsea defending here, as van Persie's clipped free-kick into the box finds Koscielny utterly unmarked. He steers his header past a stranded Cech but against the crossbar. The ball bounces back into play and Chelsea smuggle it clear. Arsenal's two best chances, both ending up against the woodwork, coming from free-kicks one by Oxlade-Chamberlain.
Oxlade-Chamberlain wins another free-kick for Arsenal in a dangerous position, about 40 yards from goal and central, after being caught by Malouda.
Rosicky's cross towards Walcott is hammered clear by Cahill.
Poor corner from van Persie, easily cleared.
Blistering 20 seconds start with Chelsea appeals for a penalty as Sagna shoves the speeding Bertrand to ground ends with Walcott's cross at the other end being turned behind for a corner.
The corner pinballs through the Chelsea penalty area without anyone coming close to applying a crucial finishing touch.
Terry gets a crucial touch to the free-kick to prevent Vermaelen getting on the end of it. Corner to Arsenal.
Terry bundles Walcott to the ground and then aims an unnecessary kick at the loose ball. Walcott unhappy, and Dean steps in to just calm things down there.
Neat work from Chelsea on the right ends with a low cross from Bosingwa that Vermaelen hacks to the safety of the stands. Chelsea have a throw-in.
No joy for Kev's predictions, then. It was brave to pick a substitute to net the opener.
Gibbs' mishit clearance falls to Bosingwa, but Chelsea can't make anything of it.
A promising Arsenal break is stymied by its lack of pace, with Chelsea eventually bringing the ball clear.
30 Rosicky earns a caution for a late challenge on Essien. Both sides now back to 11 players, by the way.
Rosicky and Walcott can't find a way through a packed Chelsea defence.
The Chelsea man seems to have come off worse. He's still down on the ground, while Sagna is back on his feet.
Hold-up in play here after a clash of heads between Sagna and Malouda. Play eventually continues with both sides temporarily down to 10.
Terry and Cahill challenge for Malouda's corner, but neither makes meaningful contact. The ball spins out of play. Referee Dean gives a goal-kick, much to the annoyance of Terry and Cahill.
Another chance for Chelsea as Kalou wins a foot-race to the ball and gets past Szczesny but Laurent Koscielny is able to smuggle the ball behind.
Ramsey caught in possession again, but Malouda's shot loops over the bar after deflecting off a team-mate.
Gary Cahill meets the corner, and his skewed header turns into a decent chance for Torres, whose shot on the turn is blocked by Song.
Florent Malouda's corner is met by Torres, but there's a touch off a defender before it goes behind. Another corner for Chelsea.
Promising break from Chelsea ends with Kalou's cross being turned behind by a defender. Torres was lurking at the back stick.
Kieran Gibbs' quick feet get him into the Chelsea penalty area before he overruns the ball at the crucial moment and the chance is gone.
Patient passing from Arsenal, but they're making limited forward progress.
Cech claims a cross from the left, before Vermaelen collides with John Terry to leave the Chelsea man flat on his back. Home fans: unsympathetic.
Van Persie flagged offside again - less doubt about this one - before lifting his shot over Cech and onto the crossbar.
Rosicky carelessly gives the ball away in midfield to set Essien marauding away. But Arsenal have sufficient numbers back to slow Chelsea's progress before, eventually, a tame Jose Bosingwa cross is gathered by a tumbling Szczesny.
Chelsea break, but Torres' cross from the right is easy for Wojciech Szczesny.
Poor set-piece, High, floaty, and easy for Cech.
Arsenal win a corner off Ryan Bertrand.
So the first clear sight of goal comes Arsenal's way. Wasn't a sitter by any means, it came to van Persie at a slightly awkward height. But from that range and with his record, you'd expect him to score.
What a chance! Walcott clips the ball gorgeously to the back post, where van Persie arrives but stabs the ball onto the outside of the post with Cech rooted to his line by the quality of delivery.
Oxlade-Chamberlain cuts inside from the left and is clipped on the heels by acrossing Michael Essien to hand Arsenal a free-kick in a promising position about 30 yards from goal and out towards the left of the penalty area.
The ball breaks to Torres after a crunching challenge in the centre-circle. He feeds Kalou on the left, who dallies over his cross and allows Sagna to get across to block.
Teasing left-wing cross from Kalou just evades Torres who had, in any case, strayed the width of a leg offside.
Don't actually do that.
Kev's back, meanwhile. Mata in the 27th minute, Ox double 49 and 73. You all might as well switch off now; the result is known.
Van Persie's forward progress halted by a marginal offside flag. Game livening up nicely now.
Kalou bursts into the box on the left-hand side but can never quite get the ball under his full control before taking a theatrical tumble over Bacary Sagna's challenge. Mike Dean uninterested in that one. Couple of decent moments for Chelsea, though.
Promising position for Chelsea on the break after Aaron Ramsey is caught in possession, but a heavy touch from Torres under pressure from Thomas Vermaelen sees the ball run harmlessly out of play to hoots of derision from the home fans.
Promising forward burst from Tomas Rosicky, who surges into space opened up by Theo Walcott's off-the-ball run, but then scuffs his shot straight at Petr Cech.
Chelseat taking their turn to knock the ball around the billiard table surface at the Emirates. First five minutes in a word: cagey.
Fernando Torres turns away from Alex Song, who trips the Chelsea striker on halfway.
Chelsea get the ball for the first time, but a promising position comes to nothing as Salomon Kalou and Daniel Sturridge fail to link up.
Chelsea picking up where they left off on Wednesday night: watching the other side pass the ball around.
Early possession for Arsenal, knocking the ball around calmly in defence and midfield.
Arsenal get us under way at the Emirates.
Should be noted, though, that I'm nearly always wrong about these things.
General view seems to be that Chelsea will struggle after making so many changes. I'm minded to go the other way; think they would've had more trouble had they picked the same side. Wednesday night must've taken plenty out of the players. Fresh legs the order of the day.
Macdara: "I'm a Chelsea supporter and I'm looking for a 2-1 win with Sturridge and Torres to score for the Blues and Van Persie for Arsenal."
Kevin goes specific: "My prediction is 2-1 to Arsenal with Mata scoring first in the first half, and Oxlade-Chamberlain with two in the second half. COME ON ARSENAL!" I want to know the exact minutes of these goals, Kev. Otherwise it doesn't count.
"i had good feelings before the Spurs and Barca games," says Tommy. "Not so confident with this one. I think this is where our hectic schedule will start to catch up with us, a narrow loss for the Blues today, hope Torres can get on the score sheet either way. COYB!"
Paul fears for Chelsea today: "I believe the strain of Champions League semis vs Barca will wear heavy on Chelsea today. Am seeing Arsenal winning the game, rather easily."
Let me know your thoughts, predictions, fears and expectations on Dave.Tickner@bskyb.com
Arsenal: Szczesny, Sagna, Koscielny, Vermaelen, Gibbs, Ramsey, Song, Walcott, Rosicky, Oxlade-Chamberlain, van Persie. Subs: Fabianski, Diaby, Andre Santos, Djourou, Gervinho, Chamakh, Coquelin
Chelsea: Cech, Bosingwa, Cahill, Terry, Bertrand, Essien, Romeu, Malouda, Sturridge, Torres, Kalou. Subs: Turnbull, Cole, Lampard, Mata, Mikel, Meireles, Ferreira
The teams are in, and there are a host of changes from Chelsea with one eye on the small matter of Tuesday's trip to the Nou Camp...
The reverse fixture wasn't a bad old game, Chelsea leading twice before eventually getting Van Persied 5-3 at Stamford Bridge in October.
Welcome to our live coverage of this crucial London derby as the race for Champions League qualification hits the home straight. Arsenal's surprise defeat to Wigan has given the chasing pack renewed hope of continuing the fight for third, while Chelsea come into this match in high spirits on the back of a thumping FA Cup semi-final win over Tottenham and that Champions League semi-final first-leg victory over Barcelona.