Brighton came from behind to beat an ill-disciplined Chelsea side who had a player sent off for the second Saturday running.
Substitutes Danny Welbeck and Maxim de Cuyper scored during 11 minutes of added time as the visitors profited from Trevoh Chalobah’s 53rd-minute red card.
The Blues had been coasting to victory in the first half when Enzo Fernandez headed in Reece James’s cross, via a deflection off Brighton winger Kaoru Mitoma.
However, Mitoma played a key role in the game’s big turning point – as he won possession from Chelsea’s Andrey Santos, on his first Premier League start, leading to Chalobah’s desperate challenge on Georginio Rutter.
After a lengthy video assistant referee check, Chalobah was dismissed – seven days after goalkeeper Robert Sanchez was sent off early in their 2-1 defeat at Manchester United.
And Welbeck benefited by scoring twice – getting his first, shorty after coming on, by heading in the equaliser at the far post in the 77th minute.
De Cuyper then headed Brighton in front from a corner in the second minute of stoppage time – before Welbeck finished from close range to seal victory in the ninth.
Chelsea, who drop to seventh place, left the field to a smattering of boos. They have not won a Premier League match since the international break, with Liverpool next to visit west London.
Meanwhile, Brighton rise into to 10th place after another positive result against big six opposition.
