The 200-1 outsider Maoi Chinn Tire caused some excitement at Wetherby, becoming the biggest priced winner since 1990 when Equinoctial claimed the record at 250-1, with a victory in the Listed Weatherbys Bank Wensleydale Juvenile Hurdle.
Jockey Alan O'Keefe was aboard the surprise victor, with a steadied start took keen hold towards the rear, making steady headway to chase the leaders approaching three out, hitting the lead approaching two out, running well clear of the rest of the field for a decisive victory by nine lengths over Meetings Man.
Race favourite Domtaline had a disappointing outing making a number of jumping mistakes and finished well back in the field in eighth place was another fancied runner to disappoint, finishing down the field after a series of jumping errors.
"I didn't expect that!" said the winner's very happy trainer Jennie Candlish.
"He'd done nothing wrong at home and settled in brilliantly, but we obviously didn't know if he'd stay.
"He'd taken everything in his stride, so all credit to his previous connections.
"He went to Yogi Breisner for three days and he told us that he would be grand.
"His home work has been brilliant. We got him out of a claimer and obviously people don't like to lose horses, but that's the risk you run.
"Whether today is his Gold Cup or not, it doesn't matter."
Winning owner Alan Baxter said, "I managed to back him at 300-1 so he has nearly won back the Â£7,000 we claimed him for!"