The individual eventing event, part of the equestrian program at the 2004 Summer Olympics, was held from 15 to 18 August 2004 in the Olympic Equestrian Centre on the outskirts of Markopoulo in the Attica region of Greece.
During the first jumping phase, she received 14 time penalty points in an otherwise flawless round.
In the final jumping phase, Hoy moved into first place and was awarded the gold medal on 18 August.
The Court of Arbitration for Sport ruled on 21 August that the appeal had been incorrectly upheld and ordered that the 14 points be returned to Hoy's score.
For the dressage portion of the competition, horse and rider pairs performed series of movements that were evaluated by judges.
This was then subtracted from 100 and multiplied by 1.5 to determine the number of penalty points awarded for the round.
In the cross country phase, each pair had to traverse an obstacle course spread over a track of approximately 5.57 kilometres.
25 pairs of horses and riders qualified, but only three from each NOC were allowed to compete.