Indonesienne cut down the front-running Lesstalk In Paris to win the Total Prix Marcel Boussac at Longchamp.
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Ioritz Mendizabal took two lenghts out of the field over a furlong out aboard the trailblazer and looked set to hold on but the Christophe Ferland-trained winner had other ideas.
Thundering down the centre of the track under Flavian Prat, the daughter of Muhtathir was in front inside the final 50 yards for an ultimtely cosy win.
Indonesienne was paying a compliment to last week's Newmarket winner Miss France who had beaten her last time.
The Charlie Hills-trained Queen Catrine snatched third in a photo. Richard Fahey's Sandiva looked a threat to all a furlong out but faded inside the distance to finish seventh, while Aidan O'Brien's Wonderfully was doing all her best work in the closing stages.
Ferland was gaining consolation after Chalnetta was disqualfied from first place in Saturday's Prix Royallieu.
He said: "It was disappointing yesterday with Chalnetta, but we are over that now and this is fantastic.
"We took a chance and it has worked. I knew she had great acceleration from her first race and she was able to show it."
Hills was delighted to see his filly make the frame on ground that he thought did not really suit.
He said: "The main thing is that she's shown us she stays a mile which opens up options for next year.
"We will give her a nice break but today's race was run on tacky ground and it turned into a bit of a slog."
Hughes felt Sandiva was thoroughly unsuited by the ground.
He said of Richard Fahey's runner: "The ground was very sticky and it didn't suit my filly at all. That was not her true running."
Sky Bet installed the winner at 20/1 in their betting for next year's 1000 Guineas, but cut Miss France from 8/1 to 6/1 for the same race.
"It was a good result for a little-known trainer, but the most important aspect of the result might well be the compliment she paid to Miss France, who has already proved popular in the betting after her Newmarket victory," commented spokesman Michael Shinners.