Western Hymn stretched his 100 per cent record to three as he successfully stepped up to Group Three company in the bet365 Classic Trial at Sandown.
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The 1/2 shot was help up in the early stages as Red Galileo and Automated made the running on the rain-softened ground.
William Buick brought the John Gosden-trained colt with a sweeping run on the outside to head 25-1 outsider Impulsive Moment and win by a length and three-quarters. Master Carpenter was third.
Buick disputed suggestions that the winner's head carriage had hinted at a reluctance to get on with the job in hand.
"Today was by far the hardest task he'd encountered, but I thought he did it well," the rider told Racing UK.
"We'll see where we are with him. He looked about a bit a furlong and a half out when he hit the front and that's a long way from home in that kind of ground. He'd not been on anything like that ground before and today was as much about giving him the experience as anything else.
"I don't think a mile and a half will be any problem. He's never done anything but finish his races off well."
Gosden, winning the race for the seventh time, added: "I nearly took him out because of the ground, but I much prefer to let them have a run when I can and I was clear with William beforehand that I didn't want him to have a hard race.
"He looked around in front, but I don't mind that. He's still quite babyish. He's got a turn of foot but you can't show a turn of foot in these kind of conditions."I was pleased with his attitude and how he stayed so he has passed the test.
"The two Derby trials in England are the Guineas and the Dante, so he'll go to the Dante and answer some more questions there. These three-year-old races come hard and fast in the spring and you've got to get on with it."
Sky Bet left him unchanged at 12/1 in their Investec Derby betting with spokesman Michael Shinners saying: "It's hard to draw any hard and fast conclusions from this race, but the fact remains that he is unbeaten and will go to the Dante as a leading player."