Race favourite Beethoven, trained by Aidan O'Brien, had a satisfying fall in class in the Desmond Stakes at Leopardstown, ridden to victory by O'Brien's son Joseph, also making it a first Pattern race win for the jockey.
The winner of Dewhurst last year has only raced on two occasions this season, after his journey to the Breeders' Cup and his last start in the Sussex Stakes where he gave a decent performance.
After being aboard on both previous starts this season, the trainer made the decision to give the ride to Joseph, who placed his mount in behind Akdarena and Emulous early in the race, moving into second place halfway through the Group Three event.
Beethoven moved into the lead one and a half furlongs out, while Dandy Boy threw down the challenge making up ground to finish in second place by three-quarters of a length.
Joseph O'Brien said: "He travelled well and quickened up well. He was the class horse of the race.
"I never had to use my stick and the ground can't be fast enough for him."
Joseph O'Brien had earlier claimed victory riding race favourite Why for his father in the Tattersalls Ireland Ltd EBF Fillies' Maiden, just staying on to keep out the quick finishing Eva's Time by a short head.