Palace Pier narrowly denied Jim Bolger's Poetic Flare to to claim back-to-back victories in the Prix du Haras de Fresnay-le-Buffard Jacques le Marois at Deauville.
Defeated only once in nine previous career starts, Palace Pier was favourite to make it four from four for the season under Frankie Dettori, having missed last month's Sussex Stakes at Goodwood following unsatisfactory blood test results.
Always travelling strongly, John and Thady Gosden's stable star moved smoothly into contention on the outside of the field, with the 2000 Guineas and St James's Palace Stakes hero Poetic Flare delivering his challenge close to the stands' rail.
In receipt of 6lb from his older rival, Sussex Stakes runner-up Poetic Flare did his best to claw back Palace Pier inside the last half-furlong, but Dettori's mount was always doing enough to hold him at bay.
The Aidan O'Brien-trained Order Of Australia finished third to make it a clean sweep for the visiting party.