A patient ride from Johnny Murtagh paid dividends as Fort Knox finished with a flourish to take the Leopardstown 2,000 Guineas Trial.
Winner of a back-end Newbury maiden in the Andrew Tinkler colours when trained by Richard Hannon as a juvenile, the full-brother to Dubawi Gold has since joined Tommy Carmody and was a 7-1 shot for this Listed contest.
Fort Knox had just one rival behind him rounding the home bend, but as the majority of the leaders began to falter, he came through with a withering run to take the prize by a length and three-quarters. Dont Bother Me and High Octane were second and third respectively.
Favourite The United States looked decidedly one paced, while Move To Strike stopped very quickly.
Murtagh's wife Orla said: "We are really happy and he's in all the Guineas. We'll have to speak to Andrew and we'll see how he comes out of the race, but on that ground he did it well - it is quite testing."
Stan James spokesman Joe Burke said: "Fort Knox was most impressive in taking the 2,000 Guineas Trial and we have cut him to 25-1 (from 40-1) for the Newmarket 2,000 Guineas, where he bids to go one place closer than his full-brother Dubawi Gold, who finished second in the 2011 renewal."