Coca-Cola Championship third-placed side Preston went down to a surprise 2-1 home defeat by Reading.
The Royals went into half-time 2-0 to the good for the second consecutive away game having also led Peterborough at London Road.
Simon Church put the Royals ahead just after the half-hour mark with a neat finish and Jimmy Kebe doubled the lead on the stroke of half-time. A Jon Parkin penalty with five minutes to go gave the Lilywhites some hope but the Royals held on.
Blackpool started the match in fifth but goals by Nicky Maynard and Danny Haynes eased Bristol City to a 2-0 victory.
Coventry claimed a 3-2 win over Watford in a see-saw game at Vicarage Road.
Sammy Clingan's fine 20-yard effort fired Chris Coleman's men ahead inside the opening 10 minutes, but Tom Cleverley soon levelled.
Striker Will Hoskins grabbed his first goal of the season eight minutes before the interval to give the Hornets a deserved lead at half-time.
However, two Leon Best goals saw the Sky Blues seal a win.
Plymouth leapfrogged Ipswich at the bottom of the table thanks to a 2-1 win at Peterborough courtesy of goals by Jamie Mackie and Rory Fallon, Craig Mackail-Smith pulling one back.
Doncaster and Swansea shared a 0-0 draw as did Crystal Palace and Sheffield Wednesday.
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