her a lovely ride". When Donnacha O'Brien retired from riding at the age of 21 in November 2019, Fancy Blue was one of the horses to join his training stable at Longfield. 2020: three-year-old season The flat racing season in Ireland was disrupted by the COVID-19 Pandemic and the Group 1 Irish 1,000 Guineas was run three weeks later than usual on 13 June behind closed doors at the Curragh. Ridden by Declan McDonogh she started at odds of 12/1 in an eleven-runner field and stayed on well from the rear of the field, two lengths behind the winner Peaceful. On 5 July the filly was sent to France to contest the Prix de Diane over 2000 metres at Chantilly Racecourse in which she was ridden by Pierre-Charles Boudot and went off the 8.1/1 fourth choice in the betting behind Alpine Star, Peaceful and the undefeated Raabihah. The other seven runners included Speak of the Devil (runner-up in the Poule d'Essai des Pouliches), Solsticia (third in the Prix Saint-Alary), Miss Extra (Prix de Sandringham), Ebaiyra (Prix de Royaumont) and Magic Attitude (Prix Vanteaux). Boudot settled his filly in second place behind Alpine Star before moving up to take the lead 200 metres out. In a closely contested finish, Fancy Blue stayed on well under pressure to win by a short neck, a head and a head from Alpine Star, Peaceful and Raabihah. Donnacha O'Brien, who watched the event from Fairyhouse said "I always knew she was a very good filly and we always thought the step up in trip would suit her. It definitely did. Pierre-Charles is a very good rider and I told him beforehand he should do what he wants. There was no pace early so he went forward on her and sat upsides the leader. It was exactly what I would have liked him to do. She quickened up well and stuck at it. The home straight felt like a lifetime". Twenty-five days after her victory in France, Fancy Blue was partnered by Ryan Moore when she was matched against older fillies and mares in the Group 1 Nassau Stakes over ten furlongs at Goodwood Racecourse in England. She went off the 11/4 second favourite behind Magic Wand (Mackinnon Stakes) in a seven-runner field which also included Nazeef and Deirdre. She settled in second place behind the front-running Magic Wand before taking the lead a furlong out