Buywise built upon the promise of his previous effort at the Cheltenham Festival when taking the Wooden Spoon Silver Trophy.
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A decent fifth in the novice handicap chase at the Festival despite making a number of alarming jumping errors, Buywise's fencing again failed to stand up to scrutiny in the early stages here.
But jockey Paul Moloney didn't panic and gradually brought the 5/2 favourite through to challenge, switching him wide at the third-last fence to give him as much daylight as possible.
As leader Real Milan suddenly started to struggle, the picture changed and Buywise swept through to lead before the final fence.
Again his jumping failed to come up to scratch at the last and he ploughed through the fence, but Moloney stuck fast and the pair stayed on up the hill to hold off Astracad by nine lengths.
Trainer Evan Williams hailed the ride given to his mount by Moloney, conceding that the horse had "jumped like his legs were tied together".
"Paul did a wonderful job, it was a phenomenal ride and I can't take any credit.
"That's him finished for the season and the next time you see him will either be in the Paddy Power Gold Cup back here or in the Hennessy Gold Cup at Newbury.
"There are no doubts at all about his engine, it is just getting the engine from A to B that can be the problem!"