First half-goals from Tatsuhiro Sakamoto and Haji Wright strengthened Coventry's position at the top of the Sky Bet Championship as they won 2-0 at Bristol City in a match that saw both teams finish with 10 men.
The visitors took a 37th minute lead when former Robins player Jay Dasilva crossed from the left and Sakamoto outjumped his marker to net with a downward header.
Coventry's task was made more difficult when Joel Latibeaudiere was sent off in the 43rd minute for denying a clear goalscoring opportunity, pulling back Emil Riis as the forward threatened to break clear.
But in first half added time the Sky Blues doubled their advantage when Wright eluded a weak challenge from Neto Borges before beating Radek Vitek with a low right-footed drive.
The game became 10-a-side in the 56th minute when City midfielder Adam Randell was shown a second yellow card for a high challenge on Josh Eccles. From then on Coventry defended strongly to secure the points.
Millwall moved five points clear of Hull in the play-off race as second-half goals from substitute Mihailo Ivanovic and Josh Coburn earned their side a 3-1 win at the MKM Stadium.
Ivanovic cashed in on goalkeeper Ivor Pandur's error in the 70th minute before Coburn's fierce hit eight minutes later provided Alex Neil's side with a victory that had looked highly unlikely after a one-sided first half.
The visitors opened the scoring after 14 minutes through captain Jake Cooper's instinctive volley from close range, but they were extremely fortunate to have been level at the break.
Hull, who twice struck the crossbar and also had a dubious goal disallowed in a breathless first half, equalised four minutes later when Joe Gelhardt scored his 12th goal of the season.
However, Neil's decision to replace floundering duo Zak Sturge and Tommy Watson at half-time proved a masterstroke.
Millwall were far more assured thereafter and left East Yorkshire with three points courtesy of goals from Ivanovic and Coburn.
Leicester put a dent in Ipswich's automatic promotion hopes but they still remain in the Sky Bet Championship relegation zone despite a 1-1 draw at Portman Road.
Patson Daka put the Foxes ahead in the 39th minute before Sindre Walle Egeli equalised for the hosts in the second half.
Town, who had several penalty appeals waved away by referee John Busby, hit a post through Dara O'Shea's header following a corner in first half in a game of few clearcut chances.
The result means Ipswich drop down to fourth, two points adrift of the automatic places, while Leicester remain in 22nd after a third draw in their last four matches.
Zan Vipotnik's 17th Championship goal of the season and a brilliant long-range effort from Liam Cullen proved enough as Swansea beat 10-man Stoke 2-0 at the Swansea.com Stadium.
Vipotnik - the division's leading scorer - glanced home a header from a corner in the 53rd minute after Wales international Sorba Thomas had received a second yellow card in the first half.
Thomas was dismissed for a shove on Goncalo Franco after 36 minutes, having been booked for a foul 13 minutes earlier.
Vipotnik's goal looked enough to extend Swansea's unbeaten home league record to 10 matches, before Cullen made sure of victory with a spectacular 50-yard effort in stoppage time.
Hayden Carter bagged a stoppage-time equaliser as Blackburn snatched a dramatic 1-1 draw against fellow strugglers Portsmouth.
Michael O'Neill's hosts had the better of a nervy encounter but looked set to be plunged into further relegation trouble when they were sucker-punched by Connor Ogilvie's deflected strike in the 84th minute.
Charlton took a huge step towards Championship safety with substitute Charlie Kelman's fifth goal of the season earning a 1-0 victory over Birmingham.
The former QPR frontman's clinically executed finish moved the Addicks nine points clear of the bottom three.
Derby kept up their bid for the play-offs with a 2-1 victory over relegated Sheffield Wednesday, who registered another unwanted record.
Although former Derby loanee Jerry Yates cancelled out Ben Brereton Diaz's opener, Matt Clarke headed the home side in front and that was enough to send Wednesday to a 13th straight league defeat.
The win pulls Derby to within three points of the play-offs, with sixth-placed Wrexham in FA Cup action this weekend.
Sheffield United and West Brom finished 1-1, with George Campbell's late goal earning them a point in Yorkshire.
Campbell redeemed himself after his own goal had given the Blades the lead earlier in the second half.
