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90 min: The ball falls for Palmer in the West Ham box, his right-footed shot is on target but it’s blocked before it reaches goal.

Five minutes added.

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89 min: James flashes a cross across goal and Areola rather unnecessarily punches Fofana’s looping ball away.

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88 min: Neto spins away from Todibo on the Chelsea left before being halted by one of Wan-Bissaka’s sprawling slide tackles.

ShareWest Ham hit the post!

86 min: It’s a bit of a sitter from Todibo, who stabs at the ball from inside the six-yard box after Soucek’s cutback isn’t dealt with by Chalobah. The ball hits the outside of the post, much to Chelsea’s relief.

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85 min: West Ham want a penalty for handball as Soucek’s cross is blocked by Cucurella. Nothing given. Caicedo hacks at Summerville, gets a yellow for his troubles and West Ham have a chance to send a free-kick into the box.

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83 min: James’s first involvement is a volleyed cross that Areola clutches at his near post. Traoré whips out the stepovers against Cucurella up the other end but his cross is easily dealt with.

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81 min: Rosenior tries to freshen things up, James replacing Gusto at right-back. Adama Traoré comes on for his West Ham debut alongside Ollie Scarles, released by Chelsea aged 11. Bowen and Diouf go off.

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Updated at 14.12 EST

80 min: Neto crosses from the left this time and Delap can’t get enough pace on the header to trouble Areola. West Ham make a rare foray forward but Sanchez intercepts Bowen’s cross. João Pedro then dinks a cross into Areola’s grasp.

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78 min: Cucurella and João Pedro combine down the left but Neto and Gusto get in each other’s way when it comes to shooting from the cross. Neto then cuts in on his left and curls a cross towards the back post, where no one in blue can get on the end of it. Reece James is getting ready to come on.

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76 min: West Ham hook a couple of balls clear of their own box but it just keeps coming back. Callum Wilson comes on in place of Castellanos up front.

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74 min: It’s worth mentioning that Chelsea have never come back from two goals down at half-time to win in the Premier League. Here they come again …

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73 min: Chelsea are not hanging about. They win a couple more corners. All the momentum is with them. West Ham, now playing with a back five, can’t get out.

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VAR is checking for a foul for a push on Kilman by Delap under the crossbar. The verdict is … goal!

ShareGOAL! Chelsea 2-2 West Ham (Cucurella 70)

Chelsea haul themselves level! Gusto heads a cross back across the six-yard box. Kilman, superbly, heads it against his own bar but Cucurella dives low to head into the back of the net!

Marc Cucurella dives to head the equaliser! Photograph: David Klein/ReutersCucurella is the second substitute to score for the Blues! Photograph: Peter Cziborra/Action Images/ReutersShare

Updated at 14.08 EST

68 min: Just wide from Castellanos! Summerville and Fernandes combine on a West Ham break. Castellanos cuts inside on his right foot and bends a shot just wide of the far post.

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66 min: Nuno makes a change, replacing striker Pablo and centre-back Kilman. Draw your own conclusions.

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65 min: Brilliant save from Areola! Chelsea’s corner is worked out to Caicedo on the edge of the box and he aims for the top corner in similar fashion to his stunning goal against Liverpool earlier this season. Areola, diving to his right, gets fingertips on it.

Alphonse Areola prevents an equaliser with an acrobatic save. Photograph: David Klein/ReutersShare

Updated at 14.00 EST

63 min: Palmer gives Fernandes the slip but the referee pulls it back for a foul, immediately apologising having not foreseen Chelsea’s advantage on the edge of the box. Cucurella wins a corner …

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62 min: It’s all Chelsea now. Neto sends a cross into the box that’s headed away but Castellanos is careless and concedes a corner. Neto takes but Areola punches up and away.

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60 min: Chelsea’s tails are up. Delap gets outmuscled by Todibo, who shields the ball out for a goal-kick. The home crowd are a bit more enthusiastic now about calling out some possible time-wasting from West Ham.

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Updated at 13.52 EST

That’ll lift the mood. Two of Chelsea’s half-time subs combine to give them a chance in this one. Will West Ham start to wobble a bit now?

ShareGOAL! Chelsea 1-2 West Ham (João Pedro 57)

A lifeline for Chelsea! Fofana runs into space on the edge of the box and digs out a magnificent cross to the back post where João Pedro is waiting to head it down into the far corner.

Joao Pedro rises to head a response for Chelsea! Photograph: Alastair Grant/APWill Chelsea’s subs turn the game around? Photograph: Peter Cziborra/Action Images/ReutersShare

Updated at 13.57 EST

56 min: Half-chance for Chelsea. Cucurella gets some space down the left and hits a low cross into a good area. Delap tries to flick it inside the far post but it bobbles wide.

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Updated at 13.48 EST

55 min: West Ham win a series of free-kicks off frustrated Chelsea players. It’s only 2-0 but feels like much more. A reminder: West Ham are still in the relegation zone.

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53 min: Chelsea haven’t got going. Summerville sets off down the left and shimmies past Fernandez before João Pedro brings him down for a free-kick. Everyone in a West Ham shirt is brimming with confidence.

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51 min: Sanchez saves from Bowen! Fernandes plays a cute ball in behind the sleeping Chelsea backline into Bowen’s path. He was probably offside but he should score anyway, instead shooting straight at Sanchez.

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50 min: Fofana drags down Castellanos after he had run in behind him. Should be a yellow but Fofana escapes. West Ham can send the free-kick into the box …

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49 min: Fernandes tests Sanchez! Some smart play down the right from Bowen and Wan-Bissaka sets West Ham up for their first attack of the half. Fernandes lets fly from the edge of the box and Sanchez pushes it away from danger. Their eyes must light up every time they go forward.

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47 min: So, Chelsea’s reshuffle – Fofana partners Chalobah at centre-back, with Cucurella in at left-back. Neto comes over to the left with João Pedro playing behind Delap and Palmer on the right. Castellanos wins a free-kick off Gusto on halfway.

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Triple change for Chelsea at the break. Cucurella, Fofana and João Pedro replace Hato, Badiashile and Garnacho – Chelsea’s entire left side. Could have happened sooner.

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That first half can be summed up in the mismatch that was Alejandro Garnacho v Aaron Wan-Bissaka. Not only did Wan-Bissaka have his former Manchester United teammate’s number in his defensive third, but he knew how to exploit him going forward too – 56% of West Ham’s attacks went down their right wing. On both of their goals Wan-Bissaka ran off Garnacho, who may not come out for the second half.

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Jarrod Bowen might threaten the top of these standings if things stay like they are:

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Very, very loud boos from the Stamford Bridge crowd on the half-time whistle. The Chelsea players gather before going down the tunnel but very few looks are exchanged between them, let alone words. They’ve been devoid of ideas going forward and pretty hapless at the back, especially on their left flank. Rosenior will make changes at the break – he was already chatting to Cucurella, Fofana and João Pedro before the whistle.

ShareHalf-time: Chelsea 0-2 West Ham

West Ham’s survival bid is well and truly on! They’ve outplayed Chelsea in the first 45 and it’s not even close. Wan-Bissaka and Bowen have been utterly brilliant down their right, where both of their goals have come. Bowen’s cross went all the way in for the opener, while Summerville converted from Wan-Bissaka’s cutback for the second.

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45+4 min: “Attack, attack, attack!” comes from a section of the home end. The boos have been growing all half. Chelsea can swing a free-kick into the box but choose to go short to Garnacho. Fernandez’s ball is eventually headed clear.

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45+2 min: Chelsea really need half-time. West Ham, playing with so much confidence, want a penalty for handball but Anthony Taylor says no. Pablo almost wriggles past Badiashile on the byline but the ball is out for a goal-kick.

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45+1 min: West Ham’s corner is cleared by Chelsea. Garnacho wins the ball on halfway and gives it away poorly. There will be five minutes of added time.

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45 min: West Ham break at breakneck speed! Summerville and Bowen combine sublimely and the latter carries the ball to the edge of the area, where he has a shot that’s deflected behind.

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44 min: Fernandez clips the free-kick into the wall, to sarcastic cheers from the away end.

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43 min: West Ham maraud down the right once more. This time Soucek’s low cross into the box misses Summerville but it’s poor defending again from Chelsea. There is respite for the hosts in the form of a free-kick won by Palmer off Pedro on the edge of the West Ham box.

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41 min: Hato and Garnacho cannot deal with Bowen and Wan-Bissaka, either defensively or going forward – a pretty big oversight from Rosenior’s point of view. Cucurella is warming up.

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39 min: Neto is down after being caught in the face in the West Ham box. VAR says it was accidental.

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West Ham get joy down the right again! Wan-Bissaka, not tracked well enough by Garnacho, makes an underlapping run past Bowen and sends a ball back towards the D from the byline. Summerville strides on to it and hits it past Sanchez at the near post. Some finish!

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Updated at 13.10 EST

GOAL! Chelsea 0-2 West Ham (Summerville 36)

It’s two! Summerville smashes Wan-Bissaka’s cut-back past Sanchez!

Crysencio Summerville doubles the Hammers lead! Photograph: Peter Cziborra/Action Images/ReutersThat was a great strike from Crysencio Summerville. Photograph: David Klein/ReutersShare

Updated at 13.20 EST

36 min: The West Ham counter ends with Wan-Bissaka flashing a ball across Sanchez’s goal. Castellanos tries a cross of his own but Chelsea stand firm this time. Mavropanos supresses a smirk after being barged over by Delap off the ball.

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