It is rare for a horse to possess both the speed and stamina to compete across all these distances, making the Triple Crown a particularly notable achievement.
Geldings are excluded from the 2000 Guineas, Derby and St Leger, in common with all European Group One races restricted to three-year-olds.
[3] Fifteen horses have won the standard Triple Crown (2,000 Guineas – Derby – St Leger), the last being Nijinsky in 1970.
In addition to Sceptre and Formosa above, eight horses have won the fillies' Triple Crown (1,000 Guineas – Oaks – St Leger), the last being Oh So Sharp in 1985.
The most recent example of this was the Aidan O'Brien trained Camelot, who finished second in the St Leger in 2012 after winning the 2,000 Guineas and Derby.