Victor Anichebe’s late strike helped West Brom climb out of the bottom three of the Premier League table, while it halted Chelsea’s bid to open up a four-point surge away from the other teams.
The Second-half substitute struck within the last four minutes of normal time to draw away a solitary point from the ‘Blues’.
Chelsea were well on course to claiming another victory after Branislav Ivanovic swept home david Luiz’s flick-on from Willian’s corner.
But Anichebe sent the Hawthorns faithful into wild celebration with an excellent flicked header in off the base of the post, after racing ahead of Luiz to Saido Berahino’s cross.
Chelsea dominated the encounter and should have gone ahead through Samuel Eto’O and Willian but goalkeeper Ben Foster was at his best to halt their progress.
The league leaders could surge back to third on Wednesday, when Arsenal hosts champions Manchester United and Manchester City face Sunderland.