Moss Tucker reversed recent form with Tenebrism to foil the odds-on favourite in the Anglesey Lodge Equine Hospital Woodlands Stakes at Naas.
A Group One winner at two and three, the Aidan O'Brien-trained Tenebrism looks set to be a big player in the all the top sprint contests this year and started off in winning form at Cork earlier this month.
Ken Condon's Moss Tucker was back in fifth on that occasion, but proved really tough in front this time having looked like being swallowed up when Ryan Moore produced the 2-5 market leader for her effort.
A length and a half was the winning margin for the Billy Lee-ridden 9-2 chance.
Condon said: "On the face of it the last day was slightly disappointing, but Billy came back in and said put a line through that. He slightly missed the break and they went steady enough for two furlongs.
"That's more his thing, a stiffer track. Ground seems to come the same to him but he's a tough, honest relentless galloper. I'm very fond of horses like him.
"Donal and Geraldine (Spring) bred him and he's given them so much enjoyment."
He added: "He could look at races like the Greenlands and we could travel with him. We might go to Ascot and races like the Flying Five. He ran in the Abbaye last year and we might go there again."
O'Brien had been looking at a King's Stand-Platinum Jubilee double bid with Tenebrism, but may now concentrate on the latter.
"It was very tacky ground and the plan was to go to the Curragh (for the Greenlands) and then do the two races in Ascot," he said.
"We might go to the Curragh and then just do the Diamond (Platinum) Jubilee. That's the way we are thinking now."
O'Brien and Moore did get on the scoresheet, courtesy of Boogie Woogie (1-2 favourite) in the 10-furlong Race & Stay Fillies Maiden.
O'Brien said: "She was green the first day and got beaten three times last year, but we always liked her.
"The plan was to come here and if everything went well she might go for the Oaks Trial at Lingfield. It would be a good education for her and she'd learn plenty there."
Also notable was the victory of the Natalia Lupini-trained Blairmayne in the Best Of Luck To Our Neighbours Punchestown Ahead Of The 2023 Festival Handicap, as it brought up the 1,000th winner of Wayne Lordan's career.
Lordan said: "I rode Winter and Hermosa to win the 1000 Guineas. I've been lucky enough to ride some good horses and plenty of Group Ones.
"Iridessa winning at the Breeders' Cup was great. It's a huge achievement to get one on a stage like that.
"I never thought that I would ride 1,000 winners. It's a hard thing to do with the jockeys that we have here. It's very competitive and I'm delighted."
