Dewsbury RAMS threw away an eight-point half-time lead as they lost 22-20 at Lingstone Press Championship rivals Workington.
It means Dewsbury stay eighth in the table but are now just two points above improving Sheffield Eagles who won at London.
Rams’ tries were scored by Dale Morton, Tony Tonks, Lucas Walshaw and Andy Kain, with Paul Sykes kicking two goals.
Ethan Flynn scored a hat-trick of tries and Dave Chisholm a brace as Bradford Bulls kept their top-four hopes alive with a 64-18 crushing of Whitehaven.
The hosts led 52-0 at the break, but the Cumbrians made a game of it after the break.
Leigh clinched a third successive league leaders’ shield with a 58-18 victory over Halifax.
The Centurions, who have stretched their unbeaten run to 20 matches, never looked back after establishing a 34-6 half-time lead thanks to tries from Cory Paterson, Lee Smith, Adam Higson, Greg Worthington, Josh Drinkwater and Andrew Dixon.
Paterson and Dixon went on to double their tallies in the second half when Fuifui Moi and Liam Kay also scored tries and Leigh’s Martyn Ridyard took his goal tally to nine from 10 attempts.
Halifax scored tries through Ben Johnston (2) and Will Sharp, all converted by Steve Tyrer, but a first defeat in eight matches leaves their top-four spot in danger.
Hunslet Hawks won a tight tussle in Championship 1 as they saw off rivasl North Wales 35-30.
George Flanagan bagged two tries for the hosts, with Daniel Williams, Michael Haley, Ayden Faal and Danny Ansell also crossing.
The result leaves Matt Bramald’s Hawks in seventh place in the table, four points adrift of the top four.
Unbeaten leaders Toulouse won 52-12 at London Skolars on Saturday and are two points clear of Rochdale.