Wolves have opened up a five-point gap at the top of the Coca-Cola Championship after beating relegation-threatened Nottingham Forest 1-0 on Saturday.
Michael Kightly's first goal since November was enough for the visitors to take a stranglehold on the title race with Birmingham being held to a draw at home to struggling Norwich.
Cameron Jerome scored with Birmingham's first shot on goal in the 38th minute but Sammy Clingan equalised with a fine free-kick that left Maik Taylor motionless on the line.
Burnley kept up their play-off charge with a 2-1 win over Plymouth at Home Park. Steven Caldwell gave them the lead but Plymouth responded almost immediately with Adam Judge firing home. It took until the 78th minute for the Clarets to get back in front as they caught Plymouth on the break with Robbie Blake running through to slot home.
Preston remain on the outside of the play-off places looking in after being held to a goalless draw by rock-bottom Charlton at The Valley. And it was a similar story for Swansea, who remain five points off the play-offs after being held to a 0-0 draw by Sheffield Wednesday at Hillsborough.
That was enough however to keep them just above QPR, who beat Bristol City 2-1 thanks to Adel Taarabt's first goal in English football. Jordi Lopez had given Rangers the lead in the 65th minute with a superb free-kick before Michael McIndoe equalised.
Down at the other end, Southampton earned a point from a 1-1 draw at Blackpool. The hosts took the lead early on when DJ Campbell earned and scored a penalty but Southampton's hopes were revived by a superb solo effort from David McGoldrick.
An outstanding goal from David Bell gave Coventry a 1-0 win over Doncaster as the visitors got it all wrong at the back. The Sky Blues had looked the better of the two sides in the opening stages and with 20 minutes gone Neil Sullivan came rushing out of his goal to clear Keiren Westwood's goal-kick straight to Bell, who finished superbly from 45 yards.
Derby and Barnsley played to a goalless draw, as did Ipswich and Watford.
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