Kalpana produced a hugely authoritative display to reverse last year's King George VI and Queen Elizabeth Stakes (G1) form with Calandagan.
The Andrew Balding-trained 5-year-old mare is a dual group 1 winner over the King George course and distance after victories in the last two runnings of the British Champions Fillies and Mares Stakes (G1), and this time at Ascot Racecourse she beat the boys convincingly under Colin Keane.
Kalpana, at just over 6-1 odds, traveled best off a building pace set by Action and Lambourn and soon took the initiative once maneuvered into the clear. While Calandagan closed from his hold-up position, he was never able to get to grips with the winner, who scored by 1 1/2 lengths.
Irish Derby (G1) winner Benvenuto Cellini was another to close from a more conservative position to finish third, another half-length back, while last year's dual Derby winner Lambourn stayed on well under pressure to take fourth place.
"She's a special mare," Keane told ITV Racing. "As the year goes on, you often see her improving from run to run. I thought she'd have to put up a personal best today to even be placed, but to go and do that is amazing.
"You couldn't get a more straightforward filly to ride. She was brilliant out of the gates, you can put her anywhere and she just relaxes. She makes my job so easy. Obviously we were waiting for Calandagan to come, he always comes fast and late.
"I thought we got a lovely pitch in the middle and controlled it to some degree. She'll only ever do enough when she gets there, but she's very game."
On riding his latest group 1 winner for owner Juddmonte, he added: "It's massive. I'm in a privileged position getting the first job to ride these horses, so you need to be delivering."
It was a second win from just three runs this season for Kalpana as she won the Aston Park Stakes (G3) in May before finding Giavellotto just a short head too strong in the Hardwicke Stakes (G2) at Royal Ascot last month.
She could only finish seventh to Daryz in last year's Prix de l'Arc de Triomphe (G1), but bookmakers were quick to cut her to 8-1 (from 20-1) for the Paris showpiece Oct. 4.
With the July 25 race part of the Breeders' Cup Challenge Series: Win and You're In, Kalpana further earned a paid, automatic berth in to the Oct. 31 Breeders' Cup Turf (G1T) at Keeneland.
There was plenty of international flavor to the race because, as well as Calandagan visiting from France, Japan was represented by Masquerade Ball and Wurttemberg, who finished seventh and ninth, respectively.
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Moonrise Shines in Princess Margaret
The Princess Margaret Stakes (G3) looked open, but it was Moonrise who stuck her neck out to win under Oisin Murphy, holding off the late charge of Dee's Funny Girl. It built on her fine second in the Windsor Castle Stakes at Royal Ascot last month, and she is 6-1 for the Lowther Stakes (G2) next month at York.
Another Breeders' Cup Challenge race winner, Moonrise earned a paid, automatic berth into the Oct. 30 Breeders' Cup Juvenile Fillies Turf (G1T) at Keeneland.
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