Pedro Neto's second-half equaliser forced a share of the spoils between Chelsea and Arsenal in a pulsating London derby at Stamford Bridge.
Gabriel Martinelli opened the scoring on the hour mark after picking up the ball at the near post and tucking a neat finish beyond goalkeeper Robert Sanchez.
But the Blues fought back just 10 minutes later, Neto gliding forward to the edge of the penalty area before lashing into the bottom corner with aplomb.
Both sides pushed for a last-gasp winner but were ultimately made to settle for a draw, leaving them four points behind second-placed Manchester City.