Brighton held their nerve to beat mid-table Chelsea at Stamford Bridge and aid their push for a European place.
The Blues scored a goal, a rare surprise for the home fans, but Conor Gallagher's long-range strike was as good as it got for the west London side.
Instead, Roberto De Zerbi's Seagulls turned it around with goals from Julio Enciso and Danny Welbeck to secure an important three points.
It was Frank Lampard's third straight defeat in his temporary run in charge of Chelsea, while Brighton remain hot in pursuit of a high Premier League finish.