Birkenshaw suffered a dramatic second-half collapse after appearing set to complete a Pennine League double over hosts Crigglestone All Blacks.
It was looking good for Birky as they went into the interval of their final DIVISION ONE match of the season 6-4 up.
They scored the best try of the game when a great offload by Mark Nichols sent fellow packman Craig Morley under the sticks, leaving Matt Honeysett a simple conversion.
But that proved to be the only highlight of a testing afternoon as Crigglestone posted 40 points without reply after the interval, with Birkenshaw suffering a number of injuries which led to their 44-6 downfall.
Wyke also lost heavily in their final outing, with Thornhill Trojans emerging 42-4 winners in DIVISION TWO. Many feel the unbeaten Dewsbury side should be competing at a much higher level, a suspicion that appears borne out by them having rattled up 696 points in just 15 outings.
Yet the Black and Whites kept them busy for long periods, with BARLA international second-row forward Ash Hutchinson scoring their response in a fine display that further enhanced his formidable reputation.
Speedster Mark Wright was the star of the show with four tries – closely followed by Tony Clarke, who registered a hat trick.
Darren Brown, Danny Sykes, Luke Cheney and Gary Crowther also reached the chalk, leaving Mike Boocock to add five conversions.
Brighouse were spared further heartache when Queensbury were disallowed four further touchdowns which they claimed were perfectly legal.