Anthony Knockaert's second-half wonder strike saw Brighton beat Crystal Palace 2-1 at Selhurst Park to move level on points with their rivals.
Glenn Murray, who was only playing after Florin Andone was injured in the warm-up, opened the scoring after 19 minutes with his now customary goal against his former club.
The home team levelled matters five minutes into the second half after Davy Propper tripped Andros Townsend in the box, with Luka Milivojevic doing the rest from the spot.
However, Knockaert's breathtaking effort - just his second league goal of the season - won it for Brighton with 16 minutes to go.
Meanwhile, Palace suffered an eighth league defeat at home this campaign.
The clash between these two fierce rivals got off to a predictably feisty start when Knockaert was lucky to only be cautioned for cleaning out Palace captain Milivojevic after just 28 seconds, the quickest Premier League booking of the season.
That early tackle set the tone for the first 45 minutes, a half in which there were few clear-cut openings, but one which saw the visitors go in ahead at the break.
James Tomkins made a complete hash of trying to head clear Shane Duffy's long clearance upfield, allowing Murray a sight of goal.
Murray still had a lot of work to do, though, to beat Vicente Guaita from a tight angle, however, the striker did brilliantly to find the far corner of the net for his 100th league goal for Brighton.
Palace, who no doubt felt a tad aggrieved to be behind at half-time, stepped up the pace in the second half and were soon back on level terms, albeit with a helping hand from their opponents.
Townsend embarked on one of his trademark dribbles that took the forward into the box, only for Propper to dangle out a leg and upend the player, with referee Craig Pawson wasting no time in pointing to the spot.
Milivojevic coolly stepped up to convert his eighth successful spot-kick in the top flight this season, but rather than be a springboard for a Palace win, it was the visitors who struck next.
Brighton boss Chris Hughton was preparing to bring Knockaert off, but before the substitution could be made, the Frenchman put his team back ahead with a goal-of-the-season contender.
The winger picked up possession down the right, before cutting inside and curling a sublime left-footed shot into the top corner of the net as Brighton scored from outside the area for the first time in the league this season.
And it was a fitting way to take the spoils in a match of this importance.
Opta stats
- Palace have won just one of their last seven home Premier League games (D2 L4) and have accrued the lowest proportion of their points in home games in the competition this season (39 per cent - 13/33)
- Brighton have done the league double over Palace for the first time since 1983-84 in the second tier
- Since the start of last season, Palace have won 19 penalties in the Premier League; six more than any other side
- Since their promotion to the Premier League ahead of 2017-18, Brighton have conceded 12 penalties in the competition; a joint-high along with Arsenal
- Murray has scored in each of his last four appearances against Palace in all competitions for Brighton
- Murray has scored 35% of Brighton's Premier League goals (23 of 66), the highest proportion of any team's goals by a player in the history of the competition
- Since his Premier League debut in February 2017, Milivojevic has scored 21 goals in the competition for Crystal Palace, more than any other player
The managers
Roy Hodgson: "It's a déjà vu situation with the games like we played here and not won - either losing by the odd goal or drawing.
"It's not because the team have been outplayed or come across an opponent who has been too good for us. It's because we've not been able to turn goalscoring opportunities into goals."
Chris Hughton: "I always maintained 40 points is the easiest and obvious one to look for. It's something to aim for and every team wants to surpass that.
"We have two wins on the spin and we've not had many back-to-back wins this season. We can try after the cup game, against Southampton, to make that three."
Man of the Match - Lewis Dunk
The centre-back was a rock-solid presence at the heart of the Brighton back line all afternoon long as the visitors returned to something approaching their defensive best.
Dunk, 27, made any number of important clearances either with his head or boot as Brighton kept Palace's dangerous forward line at bay for most of the game.
And as always, the imposing central defender was also a constant threat in the opposition box.
What's next?
Palace take on Watford at Vicarage Road in the FA Cup sixth round next Saturday lunchtime, while Brighton travel to Millwall a week on Sunday as they also look to book their place in the semi-finals of the cup.