Ethical Diamond narrowly fended off Green Impact to get back to winning ways in the Ballyroan Stakes.
Last year's Breeders' Cup Turf winner was sent off the 11-10 favourite for the mile and a half Group Three as he dropped in grade here with no penalty to carry, but the Willie Mullins-trained six-year-old had to battle hard to see off the runner-up.
The winner's stablemate Gaucher took the field along at just an even gallop, and looked at one point as if he might have pinched the race from the front under Declan McDonogh.
However, as Omni Man and Endoresment failed to pick up the leader from their more prominent positions, it was left to Ethical Diamond and Green Impact to launch challenges more towards the cenre of the track.
With Ryan Moore at full flow, the favourite prevailed by just a short-head.
Mullins told Racing TV: "We had to work harder than I thought we'd have to – that's racing!
"He was a little disappointing at Ascot, but he had a little excuse. I thought we had it right coming here, but at least he got his head in front.
"We are looking forward to the Breeders' Cup and working back. I know connections love going to Australia, but I think if he's in good form then the Breeders' Cup will be number one.
On the third, he added: "Gaucher ran a cracker. I thought he'd nicked it. He will go for the Ebor and that was a great run."