Bristol City are one win away from the reaching the Sky Bet Championship following their 1-1 draw with fellow promotion-chasers Preston North End.
Aaron Wilbraham cancelled out Jermaine Beckford's 11th goal of the season to leave the Sky Bet League 1 leaders 13 points clear of third-placed Milton Keynes Dons, who were held to a goalless draw at Port Vale, while the Lilywhites - who are now unbeaten in 14 games - remain five points clear of the Dons.At the other end of the table, Yeovil Town's second successive relegation was confirmed following a 1-1 draw with Notts County.
Haydn Hollis' own goal gave Yeovil the lead in Paul Sturrock's first game in charge but Garry Thompson's header with 11 minutes left sealed Town's fate.
Swindon Town are three points behind MK Dons, having played a game less, following their 1-0 win over Peterborough United.
Andy Williams hit the bar with a 29th-minute penalty but Jermaine Hylton ensured the miss did not prove costly by scoring the winner 19 minutes from time.
Sheffield United fought back from two goals down to earn a 2-2 draw at Oldham Athletic to strengthen their claim on a Play-Off spot.
Dominic Poleon's first-half double appeared to be sending the Latics to a first win in four but the Blades replied through Jason Holt and Jamie Murphy.
Sixth-placed Chesterfield remain four points behind United after they were held to a 1-1 draw at Barnsley.
Jay O'Shea had given the visitors the lead but they were denied a fifth straight win by Sam Winnall's 62nd-minute leveller.
Rochdale, Fleetwood Town and Bradford City all failed to take advantage of the Blades and the Spireites dropping points.
Dale were held to a 1-1 draw at Doncaster Rovers while Fleetwood fell to a 1-0 defeat to Walsall, who are now four points clear of the drop thanks to Tom Bradshaw's late winner.
FA Cup quarter-finalists Bradford are seven points off the top six with one game in hand after John Marquis scored the game's only goal in a 1-0 win for Gillingham.
At the bottom, Colchester United's four-match unbeaten run is over as they lost 1-0 to Coventry City, who move three points clear of the relegation zone thanks to Jim O'Brien's strike.
Crewe Alexandra, in 21st, and 19th-placed Leyton Orient remain level on 47 points after they played out a 1-1 draw, while Crawley Town are stuck in between the pair following their 2-1 defeat to Scunthorpe United, who had started the day level on points with their opponents.