Jorginho (right) is the first Chelsea player to score home and away against Arsenal in the same Premier League season since Juan Mata in 2012-13
Arsenal overcame David Luiz's dismissal against his old club to twice come from behind against Chelsea in an eventful London derby.
The Gunners looked beaten when Jorginho fired Chelsea ahead from the penalty spot after Luiz was shown a straight red card for bundling over Tammy Abraham.
The Chelsea forward had pounced on a terrible backpass by Shkodran Mustafi and rounded keeper Bernd Leno when he was shoved over by Brazil defender Luiz.
Chelsea were dominant for long periods but failed to kill the game off and were punished when N'Golo Kante slipped inside the centre circle allowing 18-year-old Martinelli to gallop free and produce an excellent finish, the Brazilian's 10th league and cup goal of the season.
It was Arsenal's first shot on target and came after a Chelsea corner which was cleared by Mustafi, the German atoning for his earlier error.
Chelsea thought they had won it when skipper Cesar Azpilicueta scored from six yards six minutes from time but spirited Arsenal earned a point through captain Hector Bellerin - making his first appearance since 5 December.
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Arsenal have won just one of their last eight Premier League games and face the prospect of finishing outside the top six for the first time since 1994-95.
Mikel Arteta remains without an away win since taking charge in December yet they played better with 10 men and their gutsy second-half performance was sprinkled with positives.
Luiz, who has given away three penalties in the Premier League this season - more than any other player - was left with little choice after Mustafi's under-hit pass let in Abraham who looked certain to score after going around Leno.
Yet Mustafi made up for his error with the clearance which allowed Martinelli to burst forward, after Kante's slip, and produce a clinical finish under Kepa Arrizabalaga.
Chelsea looked like they had secured a first top-flight double over their London neighbours in four years when Azpilicueta restored their lead in the closing minutes but Arteta's side were not done.
Having dropped 13 points from winning positions in the Premier League this season, they showed a determination that has been missing too often as Bellerin rifled in an equaliser to seal Arsenal's fourth successive away league draw.
What's next?
Both teams are in FA Cup fourth round action with Chelsea travelling to Championship Hull City on Saturday (17:30 GMT), while Arsenal are at Bournemouth on Monday (20:00).
More to follow.
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Line-ups
Match Stats
Live Text
Line-ups
Chelsea
1Arrizabalaga
28Azpilicueta
4ChristensenBooked at 59mins
2Rüdiger
33EmersonBooked at 21mins
7KantéSubstituted forMountat 69'minutes
5Jorginho
17KovacicSubstituted forBarkleyat 66'minutes
20Hudson-Odoi
9Abraham
10WillianSubstituted forBatshuayiat 79'minutes
Substitutes
3Alonso
8Barkley
11Pedro
13Caballero
15Zouma
19Mount
23Batshuayi
Arsenal
1Leno
2BellerÃn
20Mustafi
23David LuizBooked at 26mins
77Saka
11Torreira
34Xhaka
19PépéSubstituted forHoldingat 81'minutes
10ÃzilSubstituted forGuendouziat 55'minutesBooked at 76mins
35MartinelliSubstituted forWillockat 90+1'minutes
9Lacazette
Substitutes
8Ceballos
15Maitland-Niles
16Holding
26MartÃnez
28Willock
29Guendouzi
30Nketiah
Referee:
Stuart Attwell
Attendance:
40,577
Match Stats
Home TeamChelseaAway TeamArsenal
Possession
Home59%
Away41%
Shots
Home19
Away2
Shots on Target
Home8
Away2
Corners
Home17
Away5
Fouls
Home11
Away6
Live Text
Posted at
Match ends, Chelsea 2, Arsenal 2.
Full TimePosted at 90'+5'
Second Half ends, Chelsea 2, Arsenal 2.
Posted at 90'+4'
Corner, Chelsea. Conceded by Matteo Guendouzi.
Posted at 90'+3'
Corner, Chelsea. Conceded by Rob Holding.
Posted at 90'+2'
Michy Batshuayi (Chelsea) wins a free kick in the defensive half.
Posted at 90'+2'
Foul by Alexandre Lacazette (Arsenal).
SubstitutionPosted at 90'+1'
Substitution, Arsenal. Joseph Willock replaces Gabriel Martinelli.
Posted at 89'
Attempt missed. Michy Batshuayi (Chelsea) left footed shot from the centre of the box is close, but misses to the right.
Goal!Posted at 87'
Goal! Chelsea 2, Arsenal 2. Héctor BellerÃn (Arsenal) left footed shot from outside the box to the bottom left corner. Assisted by Lucas Torreira.
Goal!Posted at 84'
Goal! Chelsea 2, Arsenal 1. César Azpilicueta (Chelsea) right footed shot from the centre of the box to the bottom left corner. Assisted by Callum Hudson-Odoi with a cross following a corner.
Posted at 84'
Corner, Chelsea. Conceded by Rob Holding.
Posted at 83'
Foul by Mason Mount (Chelsea).
Posted at 83'
Matteo Guendouzi (Arsenal) wins a free kick in the attacking half.
Posted at 82'
Offside, Chelsea. César Azpilicueta tries a through ball, but Michy Batshuayi is caught offside.
Posted at 81'
Corner, Chelsea. Conceded by Rob Holding.
SubstitutionPosted at 81'
Substitution, Arsenal. Rob Holding replaces Nicolas Pépé.
Posted at 80'
Corner, Chelsea. Conceded by Bernd Leno.
Posted at 80'
Attempt saved. Ross Barkley (Chelsea) header from the centre of the box is saved in the bottom left corner. Assisted by Jorginho with a through ball.
Posted at 79'
Attempt missed. Ross Barkley (Chelsea) right footed shot from outside the box misses to the left following a corner.
SubstitutionPosted at 79'
Substitution, Chelsea. Michy Batshuayi replaces Willian.
Posted at 79'
Corner, Chelsea. Conceded by Héctor BellerÃn.
Posted at 77'
Attempt saved. Tammy Abraham (Chelsea) header from the centre of the box is saved in the top centre of the goal. Assisted by Emerson with a cross.
BookingPosted at 76'
Matteo Guendouzi (Arsenal) is shown the yellow card for a bad foul.
Posted at 76'
Mason Mount (Chelsea) wins a free kick on the left wing.
Posted at 76'
Foul by Matteo Guendouzi (Arsenal).
Posted at 73'
Attempt saved. Willian (Chelsea) right footed shot from the left side of the box is saved in the top left corner. Assisted by Andreas Christensen.
Posted at 72'
Offside, Arsenal. Nicolas Pépé tries a through ball, but Alexandre Lacazette is caught offside.
Posted at 70'
Corner, Arsenal. Conceded by César Azpilicueta.
SubstitutionPosted at 69'
Substitution, Chelsea. Mason Mount replaces N'Golo Kanté.
Posted at 67'
Foul by N'Golo Kanté (Chelsea).
Posted at 67'
Matteo Guendouzi (Arsenal) wins a free kick in the defensive half.
Posted at 67'
Attempt blocked. Ross Barkley (Chelsea) left footed shot from outside the box is blocked. Assisted by Jorginho.
SubstitutionPosted at 66'
Substitution, Chelsea. Ross Barkley replaces Mateo Kovacic.
Posted at 65'
Attempt saved. Antonio Rüdiger (Chelsea) right footed shot from outside the box is saved in the bottom right corner. Assisted by Mateo Kovacic.
Goal!Posted at 63'
Goal! Chelsea 1, Arsenal 1. Gabriel Martinelli (Arsenal) right footed shot from the centre of the box to the centre of the goal. Assisted by Shkodran Mustafi following a fast break.
Posted at 63'
Corner, Chelsea. Conceded by Matteo Guendouzi.
BookingPosted at 59'
Andreas Christensen (Chelsea) is shown the yellow card for a bad foul.
Posted at 59'
Foul by Andreas Christensen (Chelsea).
Posted at 59'
Alexandre Lacazette (Arsenal) wins a free kick in the defensive half.
Posted at 56'
Foul by N'Golo Kanté (Chelsea).
Show more updates
goal
Source: bbc.com