Arsenal shot themselves in the foot early on at Stamford Bridge, Shkodran Mustafi’s under-hit backpass effectively presenting Chelsea with a penalty and getting his team-mate David Luiz sent off.
Jorginho scored from the spot and it seemed that things would go from bad to worse for the visitors.
Arsenal had not had a single shot, on or off target, until with 63 minutes played, Gabriel Martinelli burst clear from the edge of his own penalty area and ran the length of the pitch to score.
Cesar Azpilcueta stabbed home from a corner to put the Blues ahead again before Hector Bellerin cut inside a curled a shot beyond Kepa to earn the Gunners a precious point.
Arsenal player ratings:
Bernd Leno: Beaten from the penalty spot by Jorginho but made important saves – 6
Hector Bellerin: Scored a late equaliser on his first game back from injury since early December – 7
Shkodran Mustafi: Oh dear. Always has a howler in him and came up with a classic here – 4
David Luiz: Booed loudly on his return to Chelsea but they were cheering when he was sent off – 4
Gabriel Martinelli evades N’Golo Kante on his way to scoring his 10th goal of the season
Bukayo Saka: Makeshift left back really struggled to cope with Chelsea’s pace at times – 5
Granit Xhaka: Dropped in at centre back after the red card. One of his better games – 7
Lucas Torreira: His usual tigerish self in midfield but had little help from team-mates at times – 6
Nicolas Pepe: Still does not look anything like a £72m signing. Needs to fulfil his potential – 6
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Mesut Ozil : Mesut who? One of those days when he drifted around on the fringes like a ghost – 5
Gabriel Martinelli: What a run for his goal. Showed massive composure to beat the keeper – 7
Alexandre Lacazette: Starved of service….