Chesterfield remain top of npower League Two despite a shock 2-1 home defeat to Burton.
The Spireites were unbeaten in the league at the B2Net Stadium before the game, winning seven and drawing one of their previous games.
Burton took an early lead when James Collins fired home a long-range shot in the fifth minute before Chesterfield levelled a minute before half-time through Derek Niven. The match appeared to be heading for a draw before Shaun Harrad scored six minutes from time for Albion's first away win of the season, but none of Chesterfield's nearest challengers could take advantage.
Port Vale are still two points behind after a 0-0 draw at struggling Northampton, who played the entire second half with 10 men after Abdul Osman was sent off for a foul on Anthony Griffith.
Shrewsbury are two points further behind, heading three clubs on 28 points, after a 1-1 draw at Stevenage.
The hosts took an early lead when Chris Holroyd converted from close range, with Matt Harold drilling home the equaliser 10 minutes into the second half.
Wycombe are up to fourth after a 1-0 win over Bradford, who played the last half hour with 10 men after Tommy Doherty was shown a straight red card for a challenge on Gareth Ainsworth.
The game was heading for a draw before Kevin Betsy slotted home from the six-yard box.
The victory means the Chairboys leapfrogged Bury, who suffered a surprise home defeat by Stockport, Wes Fletcher scoring the only goal after 15 minutes.
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