Ballyandy inched home in the Weatherbys Champion Bumper to give both trainer Nigel Twiston-Davies and his jockey-son Sam doubles at Cheltenham.
In a typically hard-fought 23-runner race, Ballyandy (5-1) got the verdict by a nose from the Willie Mullins-trained Battleford (25-1).
Mullins saddled the other placed horses, too, with Bacardys (16-1) finishing third and Castello Sforza fourth.
The winning trainer had earlier been successful with Blaklion in the RSA Chase, while the rider had struck 40 minutes earlier on Diego Du Charmil in the Fred Winter Juvenile Handicap Hurdle.