Chorley dropped yet more points in their hunt for Evo-Stik League Premier Division glory as they suffered a damaging 1-0 defeat against Rushall Olympic.
A solitary strike from Matty Wood sealed a fine victory for the Pics in a tie that the Magpies never really got going in.
The game was marred by a late red-card for Rushall’s Sam Smith who stamped on the head of Jack Dorney.
Chorley still hold a three point lead at the top-of-the-table and a have a precious game in hand over second placed Skelmersdale United.
On a crisp night, Chorley started brightly as Paul Jarvis had a corner tipped over the bar in the opening minutes, whilst at the other end Christian Dacres saw his header cannon off the crossbar.
The visitors, who sit ninth in the league dominated long periods off the first half with former Birmingham City striker Dele Adebola causing plenty of problems.
The home side had arguably the best chance of the half, as an acrobatic through ball by James Dean saw Paul Jarvis break the back line but his attempted lob was comfortably claimed by Gemmell.
Adebola then saw a header saved on the line by Ashton whilst on the stroke of half time, Jarvis’ 20-yard effort was deflected wide of the post.
Chorley started the stronger of the two sides in the second period, Adam Mather sending a cross into the box but goalkeeper Gemmell claimed the ball just before Whitham had the chance to poke the ball in the back-of-the-net.
Adebola then broke the back line latching onto a ball over-the-top but his dinked effort was saved by an onrushing Ashton.
Dean thought he opened the scoring but his header rebounded back off the cross bar from a Whitham free kick.
Substitute Chris Almond almost made the breakthrough but Gemmell saved his left footed effort whilst full-back Jimmy Turner had a shot come crossed easily saved by Ashton.
As the clock ran down and just four minutes remained, the visitors grabbed the all important goal to break Chorley hearts.
Wood skipped past Mark Ross down the right wing and slotted through the legs of Ashton to send the travelling Pics fans wild.
Chorley struggled to create chances in the four additional minutes, but there was still time for one last piece of action as Smith stamped on the head of Dorney pulling away from an earlier challenge.
Rushall held on to seal a fine victory and Chorley will go back to the drawing board as they travel to Witton Albion this Saturday.
Chorley : - Ashton, Ross, Mather, Teague (c), O’Brien, Cottrell (Stephenson, 89), Whitham, Woolcott, Jarvis (Almond, 61), Roscoe (Dorney, 74), Dean
Subs not used : - Vermiglio, Grundy (gk)
Att : 614