Chelsea 0 - Birmingham 0
In fact, Chelsea reverted to 4-3-3 with Robben again fit. Birmingham had injuries to Clapham, Upson, Izzet, Dunn, Gray, Melchiot and Sutton, plus Jarošik was unavailable as he is on loan from Chelsea.
It was a very tough game for Mourinho's side. Drogba and Duff wasted good chances to score. Terry and Lampard completed a good performance, but that wasn't enough.
Now the closer rival, Manchester United, have their best chance to catch Chelsea on the top of the table.
Birmingham: Maik Taylor; Tebily, Cunningham (c), Martin Taylor, Sadler; Pennant, Johnson, Butt (Kilkenny 87), Clemence, DJ Campbell (Forssell 57); Heskey.
Chelsea: Cech; Ferreira, Carvalho, Terry (c), Del Horno (Crespo 64); Gudjohnsen (Essien 68), Makelele, Lampard; Robben, Drogba, Duff (J Cole 64).