Two goals from Michael Ballack kept alive Chelsea's title hopes as they overcame Manchester United 2-1 in a pulsating clash at Stamford Bridge.
Chelsea's dreams appeared over after a monumental blunder by Ricardo Carvalho gifted United a 55th minute equaliser to Wayne Rooney.
Ballack had given Chelsea a 45th minute lead and he sealed a vital win in controversial circumstances by slotting home a penalty five minutes from time.
Referee Alan Wiley awarded the spot-kick after Michael Carrick handled a cross from Michael Essien.
Ashley Cole and Andriy Schevchenko cleared off the line from Cristiano Ronaldo and Darren Fletcher late on as United pushed for an equaliser.
It was a sensational climax to an afternoon of high drama in west London and the win puts Chelsea level on points with United at the top of the Premier League.