A deluge of rain turned the ground heavy and lightning in the area made it impossible for the starting stalls to be utilised, with a flag start instead required in the exceptionally challenging conditions.
Aidan OâBrienâs Whirl, the 6-5 favourite, justified that status with a five-length win, but behind her was 11-1 shot Cercene under rider Gary Carroll.
Murphy has often sought quick ground for the chestnut, who won the Coronation Stakes at 33-1 on good to firm at Ascot, but in torrential rain she showed just how tough she is with an admirable run in second, on her first try at a mile and a quarter.
âWe were delighted with the filly, Gary said she was wheel-spinning on the ground and she still ran a great race,â said Murphy.
âWe do know she needs good ground but just sheâs just sheer courage, sheâs a wonderful thing.
âSheâs unbelievable, she really is. No words can describe how genuine and honest and tough she is. She loves life.
âShe gets the trip no problem, but I think weâll go back for the Matron (Stakes, over a mile at Leopardstown) and hope the ground is good.
âSheâs the best filly Iâve ever trained and Iâve had some really good fillies.
âShe just comes out on top, you could see for yourself the courage. Pure courage. I am proud, Iâm proud of everyone. Iâm proud of myself as well!â
On whether he considered withdrawing her when the rain fell so heavily, the trained quipped: âWhen you look at the prize pot and see the cheque you could get⌠we need the money!â
Andrew Baldingâs See The Fire was the third-placed horse at 5-2 under Oisin Murphy, beaten six and a quarter lengths in total.
âConditions werenât ideal obviously, but who is to say we would have beaten the winner anyway?â said the trainer.
âShe didnât have a terribly hard time and seemed OK afterwards. We will kick on to York for the Juddmonte International.â
