Julio Enciso's screamer helped Brighton to their first-ever league win at Chelsea, strengthening their claim for European football next season with a 2-1 comeback victory at Stamford Bridge
The Blues' latest setback - their fifth Premier League game without a win - leaves Frank Lampard's side languishing in the bottom-half ahead of Tuesday's Champions League second leg with Real Madrid
Brighton had been denied in defeat by a series of VAR calls at Tottenham last weekend and while they saw two more penalty shouts waved away in the first half on Saturday, this time they capitalised on their dominance to do the double over their hosts
Enciso is just 19 but he scored a goal he will remember for the rest of his life on 69 minutes, rocketing a shot into the top corner from 30 yards before being held aloft in front of the away section by his team-mates
He had hit the post from a tight angle a few minutes earlier, as Brighton maintained their first-half pressure, which had seen substitute Danny Welbeck head in a deserved equaliser after Conor Gallagher's deflected opener
It was a statement display from Roberto De Zerbi's side, who had delivered a similar signal of their trajectory when they thrashed Chelsea 4-1 in October
The fortuitous Gallagher strike ended a Chelsea goal drought which had stretched to six hours and 27 minutes but their issues all over the pitch were on show, with the visitors out-shooting them by 26 efforts to eight
 It is going to take a substantial transformation in performance levels if they are to overturn their 2-0 deficit against Real Madrid
In the Premier League, the result leaves Chelsea 11th, closer to the bottom in terms of points than fourth
 But Brighton - who also hit the bar early on through Evan Ferguson before he was injured - are just seven points off Man Utd, who occupy that final Champions League qualifying spot
 They face United at Wembley next Sunday in the FA Cup semi-final and must not be written off on this evidence
Ahead of kick-off there was a banner unfurled in tribute to interim boss Lampard and his name was sung by the home supporters but after defeats to Wolves and Real Madrid since his return he was badly in need of a morale-boosting performance and result from his side on his return to Stamford Bridge
 But it did not materalise
With the upcoming Real game in mind, Lampard had made six changes from the Champions League loss in midweek
 Two of those incomers combined for the opener, with Mykhailo Mudryk's driving run finished off by Gallagher - who had been deployed in an advanced role - thanks to a huge deflection from Lewis Dunk which left Robert Sanchez no chance in the Brighton goal
But all those changes led to a disjointed performance overall from Chelsea
 Brighton had already hit the side-netting and struck the woodwork through Ferguson's shot from the edge of the box by that point and Kaoru Mitoma and Alexis Mac Allister sent a series of efforts at goal as they searched for a response to going behind
Brighton had seen three VAR calls go against the at Tottenham last week and there were two in the first 45 on Saturday, with Dunk arguing Enzo Fernandez had pulled him back at a corner before Christian Pulisic appeared to handle in the box
 Those decisions would not prove so costly this time
With Brighton banging on the door, Ferguson drew a super save from Kepa Arrizabalaga but injured himself in the process of the header and was forced off
 Enter Welbeck, who nodded in off the back post with his first touch two minutes and 30 seconds after coming on to repeat his trick of equalising at Chelsea from last season
After the break, Brighton continued to dominate possession, with Kepa saving from Enciso
Lampard made a quadruple change but it seemed to have no effect, with Enciso then hitting the post from a tight angle after overwhelming Reece James and Trevoh Chalobah
Sanchez was finally called into some work at the other end, saving from Gallagher but it was Brighton celebrating when Enciso picked the ball up in space outside the Chelsea box and sent a rocket into the top corner
 A goal worthy of winning any match
Chelsea tried to mount a late assault on the Brighton goal and became increasingly desperate in their search for a response but not for the first time this season they were badly lacking a cutting edge in front of goal
 In the end they mustered just two shots on target to Brighton's 10
This was not the confidence boost they needed ahead of the arrival of Champions League holders Real Madrid - but Brighton will believe anything is possible ahead of their own big cup game next weekend at Wembley
"It was the most deserved one
 More than defeats it is performance we have to talk about
 Results only come with performance
 This is a really good Brighton team, so we must give them credit
 But we were a yard short, a tackle short, a fight in a duel short and when that's not right you're not going to win games
 We need to turn that around quickly
"It's for me to try to get to the bottom of it quickly
 We need training time but we don't have training time
 For things that are a must for Chelsea at Stamford Bridge - sprints, recovery runs… it wasn't really there [on Saturday]
 From that performance we certainly have work to do
"I can't say it wasn't a bad game and we didn't deserve to lose, the players wouldn't expect that
 The only thing that matters now is a reaction
""What matters is what we deliver on the pitch
 What I say won't change what the fans are like when Real Madrid come to Stamford Bridge
 I know they'll come and support us positively
 We have to fight, that's the bare minimum
""That was better than the 4-1
 We could have played better in the final 10 minutes
 If we want to become bigger we have to improve in this aspect
 I can only analyse our performance - but maybe the game with the quarter final of the Champions League either side was better for us
 But the result is fair
"In football you can play in a lot of ways
 There isn't only one way to win
 You have to decide what you have to do and be
 We like playing in this style
 We believe in this type of play and we showed a very good quality
 I'm lucky to be coach of these players, I have to say thanks to Graham Potter
 I found a very strong team
 Then I'm working to give my idea
"We are losing too many players [to injury]
 We have to endure a tough period, two months
 We need everyone ready to play because we would like to achieve our two big targets: final of FA Cup and Europa League position
 Ferguson and Veltman can't play for a couple of weeks minimum
"About Enciso I can say he's a good, good player
 I didn't like him after the goal
 After the goal he has to play until the end of the game
 If we concede a goal and we don't win the people forget his goal
"I started thinking about FA Cup semi-final 10 minutes ago
 Another difficult game
 Man Utd one of best teams in the Premier League but we are able to win and able to fight
"Chelsea are back in action on Tuesday when they face Real Madrid at Stamford Bridge in the second leg of their Champions League quarter-final; kick-off 8pm