Wolves coasted to a 3-0 victory at home to Derby to maintain their three-point lead at the top of the Coca-Cola Championship.
Mick McCarthy's team were a goal up in the first minute thanks to Sylvan Ebanks-Blake's penalty. David Edwards then made it two just before half-time, and Ebanks-Blake's second came in the 58th minute.
Second-placed Birmingham kept pace with their West Midlands rivals and still trail by only three points, after Lee Carsley (62) gave them a 1-0 win at mid-table Plymouth.
Reading captain Ivar Ingimarsson (27) kept the promotion-chasing Royals in business with a 1-0 win at home to 10-man Blackpool, who had Lee Hendrie sent off for a high challenge on Marek Matejovsky just after the half-hour mark.
Steve Coppell's men could not extend their lead - Stephen Hunt missing a last-minute penalty - but they did enough to stay in touch with Wolves and Birmingham.
Burnley kept hold of fourth place above Cardiff, after an entertaining scrap between the two sets of play-off hopefuls finished 2-2 at Turf Moor.
Owen Coyle's hosts went in front via Robbie Blake just before the quarter-hour mark. But Cardiff recovered through Jay Bothroyd (26) and Wayne Routledge (47) to shade it - only for a Steven Thompson tap-in to level the match for good in the 76th minute.
Coventry were 2-1 winners, away to bottom club Charlton.
Chris Coleman's visitors were in front shortly before the break through Robbie Simpson, found themselves level again thanks to Deon Burton's 49th-minute penalty but hit back within seconds when Daniel Fox restored their lead.
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