Adelaide continued Aidan O'Brien's remarkable record in Sunday's Airlie Stud Gallinule Stakes at the Curragh.
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In following on from St Leger hero Leading Light last year, this colt was becoming the trainer's ninth victory in the previous 11 renewals of the Group Three.
Adelaide, who was second on his comeback in the Prix Hocquart, followed fairly close behind stablemate Mekong River and started to get down to business in the last couple of the 10 furlongs.
Boqa threw down his own challenge, but the 4-6 favourite, who has Investec Derby and King Edward VII Stakes entries, finished three lengths in front of Mekong River.
O'Brien said: "We were worried about the soft ground for him as he's a lovely-moving horse.
"He's done everything what we've asked of him so far, and he could go to Ascot for the King Edward, or there's a chance he could go for the French Derby next weekend, but that could come too soon.
"The problem with the French Derby, if you're drawn one it is very difficult over a mile and a quarter at Chantilly."
Sky Bet cut Adelaide to 25/1 (from 40/1) for the Investec Derby.