Aidan O'Brien's Ruler Of The World ran out a wide-margin winner of the MBNA Chester Vase in the hands of Ryan Moore.

The master of Ballydoyle had saddled three of the last six winners of the recognised Derby trial and his latest candidate was a 10-11 favourite off the back of a Curragh maiden victory a month ago.

Ruler Of The World tracked the early pace set by Mister Impatience, but took over from the home turn and soon stamped his authority on the Group Three contest.

Once Moore picked up his whip, his mount lengthened quite impressively to pass the post with six lengths in hand.

Mister Impatience was clear second best, ahead of Havana Beat and Feel Like Dancing. 

Moore said: "He did it nicely. The race worked out well for him as he got a nice lead.

"He's still a bit green running round here, but once I grabbed hold of him he lengthened really well.

"He'll learn a lot. Going round here will have done him good."

Paul Smith, son of part-owner Derrick Smith, said: "Aidan thinks quite a lot of him, he's been working well at home and we're really delighted with that.

"We thought he might be a little bit green and a little bit babyish.

"I think with the tight, turning track and the crowd, it was a good choice (of race) and it paid dividends.

"You'd have to be very happy with him. He stayed the trip."

Smith confirmed stablemate Battle Of Marengo would run in the Derrinstown Stud Derby Trial at Leopardstown on Sunday