Arsenal staged a late fightback to earn a point at Stamford Bridge in Saturday's London derby in the Premier League.
The derby ended 2-2 after goalkeeper errors at both ends denied either of the two sides a chance to make it three league wins in a row.
Chelsea looked about to seal their biggest victory under manager Mauricio Pochettino when Mykhailo Mudryk's mishit effort from out wide caught Arsenal goalkeeper David Raya stranded and nestled in the net three minutes after the break.
The Gunners were already trailing to Cole Palmer's 15th-minute penalty after William Saliba was penalised for handball following a VAR review.
But with 13 minutes left, Arsenal — who were sloppy and struggled to create anything — were gifted a lifeline when Declan Rice sent Chelsea keeper Robert Sanchez's poor clearance back past him into the net from 30 yards.
Then, with six minutes of the 90 remaining, substitute Leandro Trossard tucked in a wonderfully whipped cross from fit-again Bukayo Saka at the back post to draw Arsenal level and send the travelling supporters into delirium.
The result sees Arsenal move back to second position, level on points with leaders Manchester City who have a superior goal difference, while Chelsea climb up to 10th position in the early standings.