KINGSBARNS staked his Classic claims with an authoritative display in the Racing Post Trophy at Doncaster.

Unheard of until just over a fortnight ago, the Galileo colt needed to be supplemented for the final Group One of the season.

Ridden confidently by Joseph O’Brien, the Aidan O’Brien-trained colt justified strong market support to win at 15-8 and is now as low as 3- 1 for the Derby.

‘‘We’re obviously delighted. He’s only a baby coming here but he’s got an unbelievable cruising speed,’’ said the master of Ballydoyle.

‘‘All the boxes were ticked at home - his speed figures, his recovery, his visuals and everything we do at home.

‘‘The boys (owners) made the decision to let him come on his own. I’m a coward, I’d have run them all.

‘‘He’s very exciting. It’s hard to put the two-year-olds in an order but none of ours had won here (this season) before this so we took it down to the wire!’’ Jack Dexter (4-1) continued his ascent through the sprinting ranks with his third straight victory over three different trips in the Genting Casinos Levy Board Handicap.

Having won the Bronze Cup at Ayr over six furlongs and the closing handicap on Champions Day at Ascot over seven last week he showed his versatility by handling the drop to the minimum distance.

The soft ground help Graham Lee nurse him into the race and Jim Goldie’s three-year-old held off Jamaican Bolt by a neck.

Goldie said: ‘‘I’d imagine he’s up to Group races now.’’ Brian Meehan is dreaming of a crack at the 2000 Guineas with Invincible Warrior (5-2) who prevailed in a tight finish for the Park Hill Hospital Stakes.

‘‘We were confident coming here, he’s a lovely colt and he’s only been running on the all-weather because it’s safe at this time of year,’’ said Meehan.

‘‘He’ll definitely be better on better ground and Kieren said not to run him on soft ground again.

‘‘We’ll look at a trial, the Craven, Greenham or the Free Handicap.’’ Tadhg O’Shea was given a two-day ban (November 10 and 14) for his use of the whip on the unplaced favourite Taayel.

Ayr Gold Cup winner Captain Ramius (100-30) turned around the form with his Ascot conqueror Skilful in the Racing Post Supports Prostate Cancer UK Conditions Stakes.

The Kevin Ryan-trained six-year-old held off Justineo by a length and a half.

Mark Johnston’s Party Line (12-1) won for the fourth time this season in the Racing Post iPad App Handicap under Martin Lane.

She looked a sitting duck for Art Scholar inside the final furlong but Party Line was not for passing and won by a length and a half.

‘‘I hate seeing my jockeys sat there motionless, I always think it’s bad news,’’ said Johnston.

‘‘Martin gave her a fantastic ride. I’ve given her a couple of entries at Newmarket next week and it’s not impossible she’ll run again.

‘‘It’s a long winter.’’