Felix, a constant menace with his quick feet and clever movement, forced Pickford to save his effort from 18 yards.

Hampered all season by a lack of cutting edge, Chelsea had scored more than once in just two games in all competitions in 2023.

– Sting in the tale –

Netting three times at Leicester in their previous match had given Potter encouragement that he had solved Chelsea’s attacking woes.

There was undoubtedly more vibrancy about Chelsea and Felix rewarded their territorial dominance in the 52nd minute.

When Ben Chilwell’s cross deflected to Felix just inside the Everton area, the Portugal star seized his chance with a low drive that beat Pickford and cannoned into the net off the far post.

Felix’s first goal in seven games was nearly followed by an Everton equaliser moments later when Michael Keane headed wide from Demarai Gray’s free-kick.

It was a warning Chelsea failed to heed as Everton equalised in the 69th minute.

Conjuring a goal straight from the Dyche playbook, Everton struck from Dwight McNeil’s corner as Ben Godfrey flicked on and Doucoure nodded home from close range before Havertz could clear off the line.

Chelsea were back in front seven minutes later as Reece James’ run was halted by Godfrey’s trip and an equally clumsy challenge from James Tarkowski in the area.

Havertz scored a crucial penalty in the Champions League last-16 win against Borussia Dortmund recently and he coolly sent Pickford the wrong way from the spot for his ninth goal this season.

But there was a sting in the tale in the 89th minute as Doucoure picked out Simms’ surge into the Chelsea area.

The striker shrugged off Kalidou Koulibaly’s weak challenge and hit a low shot that crept under Kepa Arrizabalaga to salvage a point in heart-stopping fashion.