YORK Acorn slipped up in the fight against relegation after suffering a 20-10 defeat at fellow strugglers Thornhill Trojans.
York led 10-8 heading into the final quarter, thanks to Clayton Shepherdson, who was earlier sin-binned, and Adam Lee tries, the latter converted by Antony Chilton.
Thornhill responded in emphatic fashion, following an early score from Joss Ratcliffe and two Joel Gibson goals.
Gibson restored parity with a penalty goal before Will Gledhill nipped over and Josh Clough sealed a vital win for the Trojans in the dying stages. Gibson appended his fourth goal.
Acorn now sit 10th, three points and one place adrift of safety, trailing Pilkington Recs, who won 30-20 at Rochdale Mayfield.
With three National Conference League premier division games left, Josh Mortimer's side are a point above second-from-bottom Thornhill and five points clear of foot-of-the-table Egremont Rangers, whose relegation was confirmed after a 98-4 thrashing at Lock Lane.
Acorn host fourth-placed Thatto Heath Crusaders on Saturday (2.30pm).
Meanwhile division two leaders Heworth entertain nearest challengers Barrow Island on Saturday (2.30pm), knowing that two points would seal the title.
That comes after a 48-12 win at Wigan St Judes, a victory inspired by a George Elliott hat-trick and Liam Richmond's brace.
Danny Allan, Jack Earl, Adam Dent and Johnny Payne also crossed for the Villagers, with the former adding six goals.
Max Dudley and Lewis Melling went over for Wigan as Danny Cassidy and Barry Rothwell added the respective conversions.
Elsewhere, New Earswick All Blacks fell to a fourth straight Yorkshire Mens League premier division defeat when they lost out 20-30 at home to Siddal Academy.
Josh Prenty, Ben Husband, Jack Law and Jack Stearman were New Earswick's try-scorers.
The All Blacks head for Brighouse Rangers on Saturday, August 20 (2.30pm).