Hector Bellerin's first Premier League goal since January 2018 rescued a point for 10-man Arsenal, who fought back twice to secure a 2-2 draw at Chelsea despite having David Luiz sent off on his return to Stamford Bridge
The Gunners' chances were dealt a severe blow midway through the first half when Luiz was sent off after taking out Tammy Abraham when he was through on goal after Shkodran Mustafi's woeful backpass
Jorginho made no mistake from the penalty spot to give the hosts the lead going into the break, but the Gunners hit back early in the second half through Gabriel Martinelli, who took advantage of N'Golo Kante's slip to score his 10th goal of the season
Chelsea thought they had nicked all three points when Cesar Azpilicueta bundled the ball home with six minutes remaining, but Arsenal leveled again just three minutes later through Bellerin to keep their slim chances of a top-four finish alive
A point keeps Frank Lampard's side fourth, six points clear of fifth-placed Manchester United, who play Burnley on Wednesday
 Meanwhile, Arsenal stay 10th, 10 points behind the Blues
Chelsea had Arsenal on the back foot from the very first whistle and the visitors needed a last-ditch block from Mustafi to keep out Mateo Kovacic's goal-bound shot in the seventh minute
Andreas Christensen then nodded well wide from a corner and Tammy Abraham saw a header saved by Leno from close range, before Callum Hudson-Odoi's attempted cross clipped the crossbar after almost catching Bernd Leno out as the Blues' dominance continuedIn the end, it was a moment of madness from Mustafi that gifted Chelsea the lead, and a numerical advantage
The German's under-hit back pass left Leno stranded on the edge of his own penalty area as Abraham rounded the Gunners goalkeeper
 With the England forward about slide the ball into an empty net, Luiz bundled him down from behind to receive his marching orders
After lengthy protests from the visitors, the Brazilian slowly made his exit from the field, much to the delight of the home fans, and Jorginho slotted home the spot-kick to leave the Gunners with a mountain to climb
Despite Chelsea's dominance on the ball, the Gunners found a way back into the match when Martinelli kept his composure on a rare Arsenal breakaway
The 18-year-old capitalised on Kante's slip on halfway before racing through on goal and calmly slotting the ball past Kepa Arrizabalaga to bring his side level
Alexandre Lacazette soon had the ball in the net again as the 10-man Gunners went for more than just a point, but his strike was correctly ruled out for a clear offside
Azpilicueta then popped up in the penalty area to sweep home from close range for what he and his side thought was the winner, but the Stamford Bridge celebrations were cut short when Gunners captain Bellerin drilled home into the bottom corner to seal a point
Chelsea boss : "I am disappointed given the situation of the game
 We completely deserved to go 1-0 up
 For a little bit after that, we were getting used to them with 10 men
 But we created enough chances in the second half, it was just the same old story, we couldn't take them
 In football, basic errors can cost you points
"Arsenal head coach : "Time will tell if this is a stepping stone, but at least I saw a reaction
 I demand from the players that they never give up, we have to keep playing with the spirit we showed in every game
 I'm proud of the way they reacted
 They stepped up - if a team-mate makes a mistake, they have to have their back
 It's a good point in the end
"Gabriel Martinelli's equaliser was his 10th goal in all competitions this season, making him the first teenager to reach double figures in a single season for Arsenal since Nicolas Anelka in 1998-99
The Brazilian youngster is a real bright spot for the Gunners so far this season and Arteta was full of praise for the 18-year-old
"He is a great kid," Arteta said after the game
 "He gets in the box
 He plays against Cesar Azpilicueta who is one of the best defenders in the league and keeps taking him on
 That is not easy
"Martinelli's equaliser sparked wild celebrations from the Arsenal players
Chelsea travel to Hull City on Saturday for their FA Cup fourth-round clash; Kick-off 5
30pm
Arsenal are also in FA Cup fourth-round action when they travel to Bournemouth on Monday, January 27; Kick-off 7
45pm
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