Sam Thomas' Our Power left his challenge late as he overhauled Flegmatik after the last in the Coral Trophy Handicap Chase at Kempton on Saturday.
Sam Twiston-Davies partnered the eight-year-old who came out of the chasing pack to wear down Flegmatik who went for home a long way out under Harry Skelton.
A better jump at the last gave Our Power the upper hand and though Flegmatik rallied and pushed his rival all the way to the line it was Our Power who held on by a neck.
Frodon ran a great race under top weight in third with Bobhopeornohope fourth and Killer Kane fifth.
Last weekend's winner and favourite Cap Du Nord disappointed and finished last of the nine finishers.
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It was another feature handicap chase for Thomas who won the Becher Chase with Al Dancer and the Classic Chase at Warwick with Iwilldoit.
The winner is now 10/1 from 16s with Betfair for the Ultima at Cheltenham.
“I’m so pleased for Dai (Walters), James and Jean Potter (owners) who are unswerving supporters of the game,” said Twiston-Davies
“He was fantastic early in the season when he won at Ascot.
“This was only his second run of the season and it’s a fair training performance to win a £100,000 handicap and then this.
“I was only ever three deep at worst and he’s such an economical jumper. I thought halfway down the back he would keep getting there and in the straight he was very good coming between horses. He’s not the biggest, but he has scope and can go in and out.
“He’s the right type for the National and I feel now would be the right time. But he’s on 63 (in list of runners) so would need a few to come out.
“He’s an accurate jumper and can also be quite bold. I think he’s got what it takes for the National and it would be great for Sam who is a good friend and a very good trainer.”
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