The Yeung's Index shows each horse's winning chance, based on its past records, runnings and final positions. The higher the better, the index is a quick and useful reference. In fact, taking Yeung's Index as betting guide has yielded a positive return for 10 years, out of12.

Take the 2001/02 season as example, the annual yield of Yeung's index is 184%. A wise investment, you may call it.

The Flemming Index, another useful index, computes the expected return of betting a horse under different odds ranges.