Honor Bound landed a third Betfred 7.5 Million Scoop6 Today Oaks Trial Stakes in recent years for Ralph Beckett.
The Hampshire handler had previously landed the Lingfield prize with Kayah in 2007 and last year with Secret Gesture as well as sending out subsequent Oaks heroine to finish a close second in 2008.
Beckett saddled three runners on this occasion and it was the 12/1 outsider of the three, Honor Bound, who narrowly prevailed in the Listed contest from Criteria.
Ryan Moore had cut out much of the running aboard Queen's Prize, with 11/4 favourite Casual Smile seemingly poised to challenge on the inside rail, until Momentus and Criteria began to race in earnest.
Casual Smile found nothing for pressure and quickly faded out of contention, as did Queen's Prize, while, in contrast, Honor Bound flew inside the final furlong.
Joe Fanning, replacing the injured James Doyle, hit the front inside the distance aboard the eventual winner but was pushed all the way by Criteria with only a nose separating the pair at the line with Momentous a length and a quarter away in third.
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The winning trainer said: "It wasn't one I expected to win, that's for sure. She missed the break and it was a bit of a surprise - she wouldn't beat me at home if I was in wellies! I was very surprised when she won at Windsor last time and today she has done nothing to help her jockey.
"She's the only horse (of mine) that didn't want to go into the stalls last year. She's a bit of an enigma, that's for sure, but she clearly has ability."
It will cost £30,000 to supplement the filly into the Investec Oaks, and Beckett added: "I'm not sure she will be in the race. I will go home and have a look at the tape then decide what to do.
"It is a difficult one. She wants proper slow ground and the ground was plenty quick enough for her today."
Criteria's trainer John Gosden was delighted with the effort of his filly, who is now Royal Ascot-bound.
He said: "She ran a great race and she will got to the Ribblesdale."