A pair of hat-trick-seeking colts put their Classic credentials on the line at Leopardstown, as Geoffrey Chaucer and Fascinating Rock lock horns in the Derrinstown Stud Derby Trial Stakes.

The former, trained by Aidan O'Brien, was unbeaten in two starts as a juvenile, including victory in the Beresford Stakes at the Curragh, while Dermot Weld's Fascinating Rock has come into his own this term and landed the Ballysax in good style last time.

It is by no means a match, though, as Obliterator only found Derby hope True Story too good on his reappearance, while Johnny Murtagh has booked Richard Hughes to ride Racing Post Trophy third Altruistic.

O'Brien sends impressive maiden winner Palace to contest the Derrinstown Stud 1,000 Guineas Trial, though if the ground remains good, then Stars So Bright could be the one to beat.

John Oxx's charge carried the same colours as her sire Sea The Stars to victory at Dundalk and is sure to have her supporters, while Weld has Limerick winner Afternoon Sunlight to call upon and David Wachman saddles easy Curragh winner Booker.

Oxx has recent course and distance winner Qewy in the third Group Three contest on the card, the Ardglen Amethyst Stakes.

The mile contest has attracted a British raider in former Lincoln winner Penitent, while Mustajeeb, second to War Command at the Curragh when last seen, represents the three-year-old brigade.

The meeting gets under way at 2.25 with the Johnnie Fox's EBF Auction Maiden. Murtagh's Sauanna Belle has arguably the strongest form, but newcomers Intenser and She's Complete represent yards that have been in excellent nick of late.

The Microsoft Ireland Maiden looks an intriguing contest, with Oxx's Marakoush taking on the regally bred O'Brien inmate Felix Mendelssohn, while owner JP McManus has both Carried and Tri Na Ceile in the Fitzpatrick Gallagher McEvoy Solicitors Handicap.