Peeress, the biggest-priced of Sir Michael Stoute's three runners, won the Kingdom of Bahrain Sun Chariot Stakes at Newmarket.
Racing down the far side of the track, the 7-1 shot, owned by the Cheveley Park Stud and ridden by Kevin Darley, led about two furlongs out and kept on strongly to beat Summitville (50-1), with Musicanna (8-1) in third.
The 10 runners were spread right across the course, with the first three home all on the far side.
The trio were always in command as Summitville took the field along in this Group One contest over the Rowley Mile.
She led until Darley asked Peeress for an effort and from then on the issue was not in doubt, the daughter of Pivotal eventually coming home one and a half lengths to the good, with another two and a half back to Musicanna.
Chic, wearing the first colours of Cheveley Park, could make no impression in the centre of the track, while Stoute's other runner Favourable Terms faded in the final quarter-mile.
Stoute said: "She can handle these conditions (soft) whereas my other two fillies prefer it quicker. She's a tough performer and I hope she stays in training next season."
Darley, who won the race last year on the now-retired Attraction, told Channel 4 Racing: "Mr Stoute said before the race the ground had come for her. She's very uncomplicated."
"Summitville gave me a great lead until we ran into the Dip and once I gave her the office to go she lengthened and kept going nicely."
"She was a little bit keen from the gate. I just wanted something to follow to get her in behind. Summitville was the only one in front of me so I followed her."
"The ground is pretty much the same all over. It's quite poached everywhere. I think this filly would probably have won wherever she was."
"She was a great substitute for Attraction. She (Attraction) will be sadly missed, but we are all relieved she is going to the paddocks in one piece."
Filed by Katie Byrne