Goals from Kaoru Mitoma and Yankuba Minteh secured an emphatic three points as Chelsea's new goalkeeping experiment backfired spectacularly.
The Japanese star controlled a long punt upfield with an exquisite first touch, before placing a first-time strike past Filip Jorgensen.
BRIGHTON put Chelsea to the sword on a night to forget for Enzo Maresca.
Minteh took full advantage to make it 3-0 just after the hour, firing past a stricken Jorgensen from close range.
Chelsea's Cole Palmer netted four in one half against the Seagulls when the teams met earlier in the season.
