For the uninitiated, the British, or English, Triple Crown consists of the 2,000 Guineas Stakes, run over a mile at Newmarket in early May, the Derby Stakes, run over a mile and a half at Epsom Downs on the first Saturday in June, and the St. Leger Stakes, run over a mile and three-quarters at Doncaster in September. The American Triple Crown, on the other hand, consists of the Kentucky Derby, run over a mile and a quarter at Churchill Downs on the first Saturday in May, the Preakness Stakes, run over nine and a half furlongs at Pimlico two weeks later, and the Belmont Stakes, run over a mile and a half at Belmont Park three weeks after that.
In both cases, all three constituent races are open to three-year-old colts and fillies so, aside from obvious disparities in terms of distance and timing, the main difference is that the British series is contested exclusively on turf, whereas the American series is contested exclusively on dirt. Chronologically, the British Triple Crown pre-dates the American Triple Crown by 66 years, by virtue of the fact that the constituting races have co-existed since 1809, as opposed to 1875.
The first horse to win the British Triple Crown was West Australian in 1853 and, since then, a total of 15 horses have done so. However, it is important that the most recent of them was Nijinsky in 1970 and, since then, only three horses – Nashwan, in 1989, Sea The Stars, in 2006, and Camelot, in 2012 – have won both the 2,000 Guineas Stakes and the Derby Stakes; the first two named were not even entered in the St. Leger Stakes, emphasising the preference for speed over stamina in the modern bloodstock market. On the other side of the Atlantic, a total of 13 horses have won the American Triple Crown, the most recent being Justified in 2018.
Notwithstanding the declining popularity of the British Triple Crown, which series is more difficult to win is, largely, a matter of opinion. However, the general consensus is that the British Triple Crown, which requires a horse to reproduce its form over a matter of months, rather than weeks, over a wider range of distances, is the more demanding.