Pyrrha stuck to her guns in determined fashion to land the totesport 0800 221 221 Chartwell Fillies' Stakes at Lingfield.
Alan Munro soon got his mount right against the stands rail from a favourable draw in eight and there was no looking back as she readily held the persistent Golden Stream by three-quarters of a length.
Red-hot favourite Reggane was a major disappointment and found little when asked for her effort two furlongs from home.
The Chris Wall-trained 100-30 winner, meanwhile, was taking her third race on the bounce and added considerable lustre to her paddock value with this Group Three success.
Winning owner Lady Tadgell said: "It is very exciting, I bought her for a song as a yearling because I saw her grand-dam win the Irish Guineas.
"We will go for the Windsor Forest (at Royal Ascot), all being well.
"We weren't sure she would stay seven furlongs today as she was very good over six, but we have to have a try over a mile."
Dyna Waltz (7-1) came from the clouds to win going away in the totesportcasino.com Oaks Trial Stakes.
Bebopalula had set a frenetic pace up front and although Henry Cecil's odds-on favourite Timepiece went to the lead with two furlongs to run, she was making heavy weather of things.
Just as it looked like the 4-7 market leader might hang on after getting the better of Ceilidh House, Ryan Moore hit top gear on John Gosden's three-year-old and powered home to score with a length in hand.
Moore said of his mount, last seen finishing ninth in the Nell Gwyn at Newmarket: "They went a good gallop and she just stayed on.
"She tries very hard and she just stays."
William Hill cut the winner to 10-1 from 33-1 for the Epsom Oaks, while at the same time pushing out Timepiece to 10s from 7-1.
Les Reynolds, Gosden's travelling head lad, said: "We are really happy with that and she just outstayed them in the end.
"She's got a great attitude and I'm sure Mr Gosden and Mr (George) Strawbridge (owner) will have a plan for her now."
A downcast Cecil said: "She was disappointing. She was hanging a bit and I don't know whether she's still a baby or she just didn't stay.
"She didn't run like she works."
Cecil gained instant compensation as Bullet Train (11-4) ran out an emphatic winner of the totesport.com Derby Trial.
Recently supplemented for the blue riband at Epsom, the Sadler's Wells colt was a promising second on his return at Newbury and obviously learned plenty from that as he was sent to the front from the outset.
Tom Queally's mount handled the downhill turn with aplomb, although Aidan O'Brien's Captain James Cook appeared to slip at the bottom of the hill and was quickly pulled up.
Up front, Bullet Train continued to bowl along and as favourite Desert Myth's run petered out, Cecil's runner kept up the gallop to hold Dubawi Phantom by two and a quarter lengths.
Victor Chandler cut the Khalid Abdullah-owned Bullet Train to 10-1 from 33-1 for the Derby.