Brighton provided another huge blow to Chelsea's dwindling hopes of winning this season's Premier League title by coming from behind to claim a well-deserved draw at the Amex Stadium.
Adam Webster found all the space he needed to head in from a corner in the second half and give the home side a point to reward a display full of energy and endeavour.
Thomas Tuchel's side started poorly and lacked authority throughout, opening the scoring against the run of play through Hakim Ziyech's well-struck low drive from outside the box.
But they failed to build on the moment, never looking assured, and for all their desperate intent simply could not find a way to restore their lead and claim the vital win.
The gap between the third-placed Blues and imperious leaders Manchester City is 12 points, with Thomas Tuchel's side having played a game more - surely an insurmountable gulf.
Brighton are now unbeaten in six games in all competitions and continue to grow in confidence and class under Graham Potter.
Lifted by their equaliser, they looked the side far more likely to win the game in the final 30 minutes, instead having to settle for a point that leaves them on 29, three short of a European qualification spot.
More to follow.
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Brighton & Hove Albion
Squad number1Player nameSánchez
Squad number34Player nameVeltman
Squad number4Player nameWebster
Squad number33Player nameBurn
Squad number3Player nameCucurella
Squad number17Player nameAlzate
Squad number2Player nameLamptey
Squad number13Player nameGroß
Squad number10Player nameMac Allister
Squad number18Player nameWelbeck
Squad number15Player nameModer
Squad number9Player nameMaupay
Squad number11Player nameTrossard
Squad number20Player nameMarch
Squad number1Player nameArrizabalaga
Squad number28Player nameAzpilicueta
Squad number6Player nameThiago Silva
Squad number2Player nameRüdiger
Squad number3Player nameAlonso
Squad number7Player nameKanté
Squad number5Player nameJorginho
Squad number22Player nameZiyech
Squad number19Player nameMount
Squad number20Player nameHudson-Odoi
Squad number9Player nameLukaku
Squad number8Player nameKovacic
Squad number11Player nameWerner
Squad number29Player nameHavertz
15Moder1Sánchez34Veltman4Webster33BurnBooked at 80mins3Cucurella17Alzate2LampteySubstituted forMarchat 76'minutes13GroßSubstituted forMaupayat 62'minutes10Mac Allister18WelbeckSubstituted forTrossardat 62'minutes15Moder
9Lukaku1Arrizabalaga28Azpilicueta6Thiago Silva2RüdigerBooked at 81mins3AlonsoBooked at 59mins7Kanté5JorginhoSubstituted forKovacicat 80'minutes22ZiyechSubstituted forWernerat 81'minutes19Mount20Hudson-Odoi9LukakuSubstituted forHavertzat 80'minutes
Match ends, Brighton and Hove Albion 1, Chelsea 1.
Second Half ends, Brighton and Hove Albion 1, Chelsea 1.
Attempt blocked. Marcos Alonso (Chelsea) left footed shot from outside the box is blocked. Assisted by Callum Hudson-Odoi.
Corner, Chelsea. Conceded by Marc Cucurella.
Foul by Marcos Alonso (Chelsea).
Solly March (Brighton and Hove Albion) wins a free kick on the right wing.
Attempt blocked. Neal Maupay (Brighton and Hove Albion) right footed shot from outside the box is blocked. Assisted by Adam Webster.
Attempt missed. Mateo Kovacic (Chelsea) right footed shot from outside the box is high and wide to the left following a corner.
Corner, Chelsea. Conceded by Neal Maupay.
Offside, Brighton and Hove Albion. Neal Maupay tries a through ball, but Leandro Trossard is caught offside.
Attempt blocked. Timo Werner (Chelsea) left footed shot from the right side of the box is blocked. Assisted by Mateo Kovacic.
Attempt blocked. Marcos Alonso (Chelsea) left footed shot from outside the box is blocked.
Antonio Rüdiger (Chelsea) is shown the yellow card.
Substitution, Chelsea. Timo Werner replaces Hakim Ziyech.
Substitution, Chelsea. Mateo Kovacic replaces Jorginho.
Substitution, Chelsea. Kai Havertz replaces Romelu Lukaku.
Dan Burn (Brighton and Hove Albion) is shown the yellow card for a bad foul.
Hakim Ziyech (Chelsea) wins a free kick in the attacking half.
Foul by Dan Burn (Brighton and Hove Albion).
Attempt blocked. Romelu Lukaku (Chelsea) header from the centre of the box is blocked. Assisted by Callum Hudson-Odoi with a cross.Our coverage of your Premier League club is bigger and better than ever before - here's everything you need to know to make sure you never miss a moment