Chelsea saw a last-gasp winner ruled out as they staged a second-half fightback at Aston Villa to salvage a point and keep their stuttering European hopes alive.
Unai Emery's side looked on course to all but seal a spot in next season's Champions League after taking a two-goal lead into the break but the Blues rallied.
An own goal from Marc Cucurella after John McGinn's badly mishit cross nudged Villa ahead and Morgan Rogers doubled their advantage before half-time.
Chelsea responded after the break, however, and superb goals from Noni Madueke and Conor Gallagher forced a dramatic share of the spoils in the Midlands.