Double Ross claimed the Stewart Family Thank You Gold Cup for Sam Twiston-Davies and his father Nigel.
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Often a front-runner in the past, the 7/1 chance was ridden a little more conservatively on this occasion as Easter Meteor and Sew On Target cut out a strong early gallop.
But he travelled strongly under Sam Twiston-Davies behind the front two and despite a couple of fiddly jumps down the back straight and another mistake at the fourth-last fence, he remained on the bridle.
Switched wide, he jumped to the front two out and quickly put five lengths between him and his rivals.
And although he started to idle close home and the fast-finishing Cantlow was narrowing the margin all the way to the line, he'd done enough to hold on.
Favourite Colour Squadron, who once again encountered some minor traffic in running in the home straight, kept on to finish third, with the brave Sew On Target fourth, just ahead of Johns Spirit and Easter Meteor.
The winning rider said: "I needed to fill him up down the hill after a mistake to try to get a bit of life back in him and when I turned in he finished really well.
"The last 100 yards were a bit scary, but he's very genuine and all credit to the lads in the yard.
"Nige was confident - I was hoping for a bit of place money but it's nice to be proven right by the trainer again. He's a very good jumper, the mistake was totally my fault at the top of the hill and he was very good to stay on his feet.
"Heavy ground is his speciaility so for him to run like this on good ground opens up more options for him."
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The winning trainer added: "He's a novice, but that's how you win these big races - he was well handicapped, possibly, and he won. He's always jumped well and done everything right.
"The softer the ground, the better for him and I nearly didn't run him today.
"Those two up front went off very quick, they made it a real test of stamina and that suited him down to the ground.
"He's just a handicapper really, but he is a novice and we have the option of dropping back and doing that and hopefully there'll be something for him here in March. He stays and he'll keep on paying his way."
Of Cantlow, trainer Paul Webber said he was still feeling proud, despite the narrow defeat.
"He made a crucial mistake at one of the ditches, it was just when they were quickening up and he could never make it up after that," said Webber. "I'm still very proud of him."