Well Chief made a stunning return to the track with an impressive win in the Game Spirit Chase at Newbury.
Well Chief's win has shaken up the Champion Chase betting
The David Pipe-trained eight-year-old had been out of action for 22 months with injury but showed no signs of rust on his return in the two-mile race.
Timmy Murphy took Well Chief up to challenge long-time leader Ashley Brook two fences out and then cruised home to win by 11 lengths.
Queen Mother Champion Chase favourite Voy Por Ustedes fell early in the race.
French raider Foreman also put in a desperately disappointing performance.
His impressive win combined with Voy Por Ustedes' fall means Well Chief has now been installed as the favourite for the Champion Chase.
We will take it day by day with him
Trainer David Pipe on Well Chief
Pipe said: "I thought he was fit enough to do himself justice and he has had a good blow afterwards. He goes on any ground and I just wanted it to be safe for him.
"He jumped better than I thought he would. Timmy came to school him during the week and he was OK, but he really came up at the first ditch and it was great to see.
"He had been showing at home that he still goes well, but we will take it day by day with him."
Runner-up Ashley Brook could bypass the Champion Chase in favour of the Ryanair Chase, which is run over half-a-mile further.
"The Queen Mother is the race we have kept in mind, but we will keep an eye on the Ryanair," said trainer Kevin Bishop.
"We'll look at the ground, have a chat with (jockey) Paddy Brennan, but we are quite well in at the weights in the Ryanair."
Earlier there was a massive upset in the Totesport Trophy, Europe's most valuable handicap hurdle.
Heathcote, trained by Gary Moore and ridden by son Jamie, became the longest-priced winner in the history of the race when he took the spoils at 50-1.
Market leaders Tarlac and Acambo never seriously threatened at any stage, with the latter pulled up.
Totepool Game Spirit Chase
1 Well Chief (T Murphy) 5-2
2 Ashley Brook (P Brennan) 9-4f
3 Armaturk (R Walsh) 16-1
Eight ran. Dist: 11, 8.
Totesport Trophy Handicap Hurdle
1 Heathcote (J Moore) 50-1
2 Overstrand (S Jones) 16-1
3 Pedrobob (N Fehily) 11-1
4 Caracciola (A Tinkler) 33-1
20 ran. Dist: Nk, 2.