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Did Arthur Masuaku want to score against them?
The late strike by Arthur Masuaku ensured that West Ham got all three points against their city rivals. (0:49)
West Ham United twice came from behind to win the game, and it was a difficult day for the Blues' goalkeeper, who had a difficult day against the Hammers.
The hosts came from behind twice to ensure a share of the points, after they had lost their previous three matches.
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Thiago Silva headed in Mason Mount's corner on 23 minutes to give Thomas Tuchel's side a deserved lead.
Silva was the hero at the other end as he used his experience to stop the effort by Vladimir Coufal.
Despite being outplayed by the Blues, West Ham were given a chance to equalise five minutes before half-time when Mendy failed to clear Jorginho's backpass.
Mendy was sent the wrong way by Lanzini after the referee pointed to the spot.
West Ham's Jarred Bowen celebrates his goal.
West Ham failed to go into the break ahead, as Mount put the Blues ahead with a stunning volley after a delightful cross.
The team was different after the interval and again tied the game on 58 minutes as Bowen powered an effort past Mendy after picking up Antonio's knockdown.
Arthur Masuaku found the back of the net with a mishit cross with three minutes left in the game, after Mendy had made a great save.
It was the first time this season that the Blues had conceded more than one goal.
Tuchel said it was impossible to make so many mistakes and expect a result.
Despite the win, he was not sure about his team's performance. He said that the goal was very lucky. I didn't think we played well today, but we got the goals.
