Deane Smalley scored the only goal as Chesterfield went nine points clear at the top of npower League Two.
Smalley netted in the first half at Bradford as the visitors made the most of Shrewsbury and and Rotherham not being in action.
Wycombe climbed from fourth to second with a 4-1 defeat of struggling Burton.
Stuart Lewis netted twice and Lewis Montrose was also on target in the first half, his shot going in off defender Darren Moore.
Sam Winnall pulled a goal back to give Burton hope early in the second half but a Scott Rendell penalty made the points safe for Wycombe.
Port Vale's play-off hopes suffered as they lost 3-1 at home to Stevenage.
An own goal from Anthony Griffith just after the half hour put Stevenage ahead and Peter Winn extended their advantage five minutes before the break. Sam Morsy netted for Vale 11 minutes into the second half but David Bridges (67) secured a 3-1 win for the visitors.
Torquay led 2-0 at Cheltenham through Jake Robinson and Danny Stevens but late goals from Jeff Goulding and Wesley Thomas earned the home side a 2-2 draw.
Sean McConville's goal earned Accrington a 3-2 home win over Crewe. Strikes from Matt Hamshaw and a Chris McCready own-goal saw Macclesfield win 2-0 at home to Morecambe.
Steve Kabba's late goal proved a consolation for Barnet who lost 2-1 at Southend who scored through Craig Easton and Ryan Hall. Northampton and Hereford drew 1-1, Andrew Holt drawing first blood before Waide Fairhurst equalised for Hereford.
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