East Leeds prospered in their must-win derby at fellow strugglers Oulton Raiders to keep alive their faint hopes of avoiding relegation from National Conference Division One.
They nudged 7-0 ahead at half-time with a try from Jason Priestley, Nathan Conroy adding the conversion and a drop-goal.
Easts powered on at the start of the second with three successive tries from Jordan Normington, Declan Thomlinson and Jacob Thompson, Conroy slotting all three kicks for 25-0.
Clayton Scott scored late on for Oulton, Andy Williamson goaling, but they lost 25-6 so their future is still unsecure, too, heading into the final round.
At the other end of the table, Milford Marlins confirmed their play-offs place with a 20-16 win against third-placed Skirlaugh.
Dave Warne’s 76th minuite try settled it with the game level at 16-16 in the latter stages.
Centres Steve Bacon and Joe Ramsden scored earlier along with second-row Tom Wilson, Ryan Oxtoby adding two goals and loose-forward James Barker earning man-of-the-match.
Gutted Thornhill Trojans lost their Division Two play-off semi-final 18-14 at Blackbrook after conceding in the seventh minute of injury time.
They led 14-0 after 70 minutes with tries from Ben Kendall and Jake Wilson, George Woodcock slotting three goals, but suffered an agonising late collapse.