Aidan O'Brien's So You Think recorded his 10th Group One victory in the 150th Anniversary of Prince of Wales's Stakes at Royal Ascot.
The former Australian superstar suffered a shock odds-on reverse in this 10-furlong prize 12 months ago, but he got the job done in good style on this occasion.
Always travelling strongly in the hands of the trainer's son, Joseph, the six-year-old (4-5 favourite) looked likely to run out an easy winner when cruising to the front halfway up the home straight.
The Queen's Carlton House emerged on the far rail to launch a serious challenge, but So You Think saw him off, asserting close home to score by two and a quarter lengths.
Carlton House just held on to the runner-up spot from Farhh, who finished as well as anything having encountered traffic problems in the straight.
The winner suffered defeats in the Breeders' Cup Classic and the Dubai World Cup, but he warmed up for his return to Ascot with a win in the Tattersalls Gold Cup at the Curragh.
O'Brien snr said after the race: "We expected a big run today, we felt like we had him in a place that he was never in before with us, which is incredible.
"I think we've had him a year and a half and it's taken me that long to learn how to train him.
"We went back and listened to what everybody was saying about him, listened to what Bart (Cummings, former trainer) was saying and telling us what to do and what not to do. We listened at the end.
"We felt he was in a place today he's never been in before.
"I was delighted to hear what Bart had to say as he was speaking from the heart and I was probably over-working the horse and galloping the speed out of him instead of letting him be natural.
"Everyone was of the opinion before we got him that he was all speed but I started off on the wrong leg with him and tried to make him stay a mile and a half and did too much with him.
"We knew we only had a few runs left (before retiring to stud), maybe today and Sandown (Eclipse) to get him back, so we listened to them and Joseph and the lads were confident it was going to come.
"It will be the boys decision when he goes to stud, but Sandown is in our head as a cut-off point. We'll be pleading hard now that we have him in this place but it's a business decision.
"We're just delighted to get him back and all I can say is sorry it took me so long to get him back to where everyone in Australia said he was. If he wasn't such a great horse I'd have made a right mess of him.
"He's one of those special horses that can travel and has class.
"We were delighted with the ride he got, Joseph knew what he wanted to do."
Winning rider O'Brien jnr added: "My horse relaxed lovely and quickened up very well.
"Ryan (Moore, on Carlton House) got a split on the inside and I just had to come around Johnny (Murtagh, on Big Blue Kitten) but once he could see the horse on his inside he was never going to be beat.
"I just wanted to get him into a rhythm and get him relaxed, he has loads of class and can quicken and when things work out he's an exceptional horse.
"It's been a great season and I'm very lucky to get to ride some exceptional horse. I owe a big thanks to Mr and Mrs Magnier, Mr and Mrs Tabor and Mr and Mrs Smith for giving me some nice opportunities."