Chelsea's hopes of opening up a four-point lead at the top of the English Premier League football ladder were dashed when Carlo Ancelotti's side were held to a 1-all draw at Hull.
The relegation-threatened Hull stunned Chelsea by taking a 29th-minute lead when Stephen Mouyokolo scored from a corner kick.
The Ivory Coast's Didier Drogba equalised with a free-kick three minutes before half-time for his eighth goal in his last nine matches for the club.
Chelsea were unable to convert their second-half pressure into a winner, and the draw leaves the leaders two points clear of Manchester United and six clear of third-placed Arsenal.
The draw was not enough to lift Hull City out of the relegation zone though, with the club sitting three places from the bottom of the table.