Timo Werner's first-half strike helped strengthen Chelsea's grip on the top four with a 1-0 win at West Ham, who saw Fabian Balbuena controversially sent off after a VAR intervention
Chelsea's winner came just before half-time through Werner's first Premier League goal since mid-February, finishing off at close range from Ben Chilwell's low cross (43)
The game opened up in the second half as Werner missed a fine chance to double his tally, turning wide at close range from a rebound, and West Ham were reduced to 10 men with a baffling dismissal as Balbuena's studs caught Chilwell's calf after following through with a clearance
After referee Chris Kavanagh consulted the pitchside monitor to view the incident, which seemed an unavoidable action from the West Ham defender, Balbuena was shown a red card
Chelsea saw the game out, meaning Thomas Tuchel's side are fourth, now three points clear of fifth-placed West Ham, with Liverpool a further point behind in sixth with five games remaining
West Ham's surprise top-four challenge this season will have no doubt strengthened desires for the 'big six' to breakaway to an exclusive European competition, with these two sides arriving on equal points with just six games remaining
Chelsea had some joy down the right early on as Werner turned Mason Mount's cross over the bar from 12 yards, before Christian Pulisic struck Werner's own low centre into the hands of Lukasz Fabianski
Chelsea had all of the ball, as expected, but were shut out by West Ham, who were keen to soak up pressure and counter-attack at every opportunity; in every home game against top-half opposition, David Moyes' side have had less than 40 per cent possession
But Chelsea scored against the run of play in a move started and finished by Werner, who now has 20 goal involvements (11 goals and nine assists) this season, more than any other Blues player
Receiving the ball with Angel Ogbonna on his back, Werner held it up well and found Pulisic, who spread out wide to Chilwell
 The German then continued his run into the box and slotted home Chilwell's low cross from eight yards with just two minutes of the first half remaining
But Werner missed a huge chance to put Chelsea 2-0 up early in the second half; after Mount's long-range effort was saved by Fabianski, the ball fortuitously fell into Werner's path, six yards out, but he skewed his effort wide of the post with just the goalkeeper to beat
West Ham were then jolted into life as Ryan Fredericks' goalbound effort was blocked well by Mount, before Jesse Lingard's clever half volley floated just wide of Edouard Mendy's left-hand post
Mount was fantastic once again for Chelsea, forcing another fine save from Fabianski with a long-range effort with little backlift, but the visitors began to retreat as the game wore on to protect their lead
West Ham's task was made more difficult, however, when Balbuena's seemingly innocuous collision with Chilwell was referred to VAR and then the pitchside monitor
Clearing the ball, Balbuena's foot caught the leg of Chilwell, who was closing down the West Ham man, and slowed down, the incident looked far worse than it was
Kavanagh dismissed Balbuena, a decision David Moyes described as "rubbish" and "made by somebody who has never played the game," and though West Ham pushed to find an unlikely equaliser, they were restricted to long-range efforts
Sub Tammy Abraham missed a clear header from close range for Chelsea in the final minute of stoppage time, but it did not matter as Tuchel's positive impact continued, this their 16th clean sheet in 20 games under the German
"It's not even a yellow for me
 This totally killed the game
 He turns, clears the ball upfield, what is he supposed to do? There can be contact and it not be a foul for me
"I'm not sure you can blame VAR for that
 The VAR has flagged the incident, it's then down to the ref to make the right decision, and for me he gets that totally wrong
 He's just clearing the ball up the line
 What is he supposed to do? He can't move his foot in a different direction, it's impossible
""You cannot believe that
 It can happen that the referee makes a mistake if he only sees the end of it, but the VAR should be in control of the situation and see it is not an intentional foul
 West Ham didn't deserve it
 It was totally unfortunate
"West Ham boss  on Balbuena red card: "I think it's a decision made by somebody who's never played the game
 I don't know where Fabi Balbuena is supposed to plant his foot
"If they do think that, you'll look at the one a few minutes later, with Coufal and Rudiger, a similar challenge, but they never did anything about it
"I don't know how it's a red card
 I don't know where he's supposed to plant his foot
 I don't think for one minute there's a bit of malice in that
 I thought it was a rubbish decision
"We'll go again, we're in a decent position
 There's games to play, hopefully we're right in the mix for some form of European football 'til the end, and I'll keep pushing to make that Champions league if we can
"Chelsea boss : "The boys are very, very happy in the dressing room, and they can be
 Great performance and amazing result, I think a well-deserved win for us
"Very tough to play [at West Ham], you can win ball possession, but you have to earn your chances, and be very, very smart
 You cannot afford to do easy mistakes and you have to be patient
"It was a pretty normal preparation, we did not talk one word about Super League from Tuesday on
 I felt everyone was very concentrated and enjoying the focus on just the game
 I am happy that we came up with an intense performance
"On Timo Werner: "He always gives everything
 He could have made it more comfortable, but very happy because he played a very good match
"West Ham now go to Burnley on Monday Night Football on May 3, live on Sky Sports Premier League
Chelsea go to Real Madrid in the first leg of their Champions League semi-final on Tuesday at 8pm, before hosting Fulham on Saturday Night Football on May 1 at 5
30pm, live on Sky Sports Premier League
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