Big Shu (14-1) led home an Irish benefit in the Glenfarclas Cross Country Chase for Peter Maher and jockey Barry Cash.
Cash last tasted Festival success way back in 2004 on Brave Inca in the Supreme Novices' Hurdle and made a bold bid for home on the final circuit.
He took five lengths out of the field and while Shakervilz, Outlaw Pete, Bostons Angel and Sizing Australia gave chase, none could get on terms.
A big jump at the last sealed victory and Big Shu ran out a convincing victory from Shakervilz.
Cash said: "We thought he was well handicapped but I hadn't done this weight in seven years.
"Fair play to Peter, he said he'd win and he did."
Maher added: "It's just a great day. We did back him so we were confident."