Dermot Weld claimed a seventh victory in the GAIN Irish St Leger at the Curragh when Voleuse De Coeurs ran riot under Chris Hayes.
The Chryss O'Reilly-owned filly hacked up under her talented pilot to take the Group One over a mile and three-quarters in impressive fashion.
Ahzeemah, the 7-2 favourite, finished second, while Saddler's Rock was third.
Royal Diamond, who won the race last year, attempted to make most of the running, but he was swamped inside the final three furlongs.
Hayes swiftly picked up the baton two furlongs from home and shot clear on the far rail.
Ernest Hemingway fleetingly gave chase, but he was soon worried out of the equation.
And while Godolphin's Ahzeemah at least attempted to give Voleuse De Coeurs something to think about, he was some six lengths in arrears at the line.
Weld said: "She ran a good race here in the Trial, and I knew she'd improve from that.
"She will definitely make a Cup mare next year.
"Today was the day we really trained her for. She is a very straightforward filly, and a model of consistency.
"She won the Cesarewitch here last year and stays very well.
"The plan was to make use of her stamina."
Toormore took his unblemished record to three with an emphatic all-the-way win in the Goffs Vincent O'Brien National Stakes.
Richard Hughes bounced the Richard Hannon-trained colt out of the stalls and set the pace he wanted.
The even-money favourite asserted a furlong to win from his main market rival Sudirman, with Giovanni Boldini third.
The form of Toormore's victory in the Vintage Stakes at Glorious Goodwood had been given a welcome boost by the success of runner-up Outstrip in the Champagne Stakes at Doncaster on Saturday.
The son of Arakan looked totally in control of his four rivals that included a Group One winner in Sudirman, whom he shrugged aside to score by two and three-quarter lengths and give owners Middleham Park Racing a taste of Group One success.
Tim Palin, racing manager for Middleham Park, said: "He's in the Racing Post Trophy (Doncaster, October 26) but will not run again this season.
"He's a very clean-winded horse, and could go straight for the Guineas next year."
Guerre could be aimed at a big prize at Newmarket next month after he made a successful debut in the GAIN Supporting Irish Horse Welfare Trust EBF Maiden.
Joseph O'Brien brought the youngster, trained by his father, Aidan, to lead over a furlong out.
The well-backed 11-10 favourite pulled away nicely to score by three-quarters of a length from Atlantic Sea, with Diamond Stilettos third.
Aidan O'Brien said: "He quickened well but got a bit tired and was green, too.
"He could turn into a Middle Park (Newmarket, 12 October) horse and I'd say he'll improve quite a bit, too."
Darwin could only finish third behind Brendan Brackan (9-2) in the Group Three Manguard Plus Solonaway Stakes.
The former US resident was supplemented for the race earlier in the week and was sent off the 4-7 favourite.
But Joseph O'Brien's partner looked rather one-paced once he went about his business and faded inside the final 100 yards.
Brendan Brackan, by contrast, cashed in on a generous pace set by runner-up Ansgar to collect by two lengths for trainer Ger Lyons and jockey Colin Keane.
Lyons said: "He was mentally slow to grow up, and we'll probably put him away now and go to Dubai."
Avenue Gabriel (4-1) found a lovely gap on the far rail to take the Listed Flame Of Tara EBF Stakes under Hayes.
The Paul Deegan-trained filly outmuscled the front-running Minorette late in the piece to win by a neck. Ballybacka Queen stayed on for second.
Odds-on favourite Dazzling twice encountered traffic problems, but never entirely looked happy along the straight.
Deegan said: "She has two nice entries in the Fillies' Mile (Newmarket, 27 September) and the Prix Marcel Boussac (Longchamp, 6 October).
"We will have to talk about it, but she will probably go for the Fillies' Mile."
Lady Ultra (9-4) provided Sheila Lavery with a first victory as a trainer in the GAIN/Alltech Nursery Handicap, while Tylery Wonder caused a 25-1 shock in the Glanbia Handicap.
Weld put the seal on a fine afternoon when the Pat Smullen-ridden Wandering Star (7-1) landed the concluding St Brigid Of Kildare EBF Fillies Maiden.