Racing Demon continued Henrietta Knight's monopoly of the totesport.com Peterborough Chase at Huntingdon by providing the popular trainer with her seventh victory in the last nine renewals of the Grade Two event.
Knight's two finest horses, Best Mate and Edredon Bleu, are already on the Peterborough roll of honour along with last year's winner Impek, but Racing Demon justified his tall reputation with a thoroughly professional performance.
Sent off the 13-8 joint-favourite, he tracked the pacesetter Thisthatandtother for nearly the duration, with none of the scratchy leaps that have characterised his jumping career and saw him come to grief in the early stages at Exeter last month.
Pushed in front in the home straight by Graham Lee, Racing Demon steamed home by four lengths from Thisthatandtother, with Monkerhostin slightly one-paced in third and Dempsey never appearing happy as the last horse home.
"I will sleep better tonight," said the ever-superstitious Knight.
"I expected him to run well, but he hadn't really raced since March. He carries his head so low, but he really enjoyed himself."
Racing Demon was cut to 9-1 from 12s by the sponsors for the Stan James King George VI Chase and Knight added: "I need to talk to the owner, but I don't think he would run until then. Mind you, I don't know if he'd beat Kauto Star, who put in some performance today.
"But Terry (Biddlecombe, Knight's husband) thinks he can run in the Gold Cup."