Politologue has won the 3.30 Queen Mother Champion Chase, beating heavy favourite Defi Du Seuil.
The 6/1 second-favourite led from the start, with Dynamite Dollars and Bun Doran finishing in 2nd and 3rd respectively.
Barry Geraghty was on for his third winner of the day, but 2/5 favourite Defi Du Seuil finished far back in fourth.
Politologue owner John Hales, speaking of jockey Harry Skelton, said: “Tactically Harry got it completely right.”
Skelton was speechless after his first win at this year’s Cheltenham Festival. “What can I say. This is magic, this is what this horse can do. I am just so grateful to everyone who gave me the opportunity,” he said.
Hales picks up a winning cheque of over £225,000 for Politologue’s victory.