[1] It was an assessment of Thoroughbred racehorses issued by the International Federation of Horseracing Authorities (IFHA) on 22 January 2020.
[2] It included horses aged three or older which competed in flat races during 2019.
For the first time, the rankings saw a three-way tie for first place between the European five-years-old Crystal Ocean, Enable and Waldgeist.
The top rating of 128 was the lowest in the history of the rankings.
[3] The top-rated three-years-old fillies Covfefe and Gran Alegria failed to make the top 100.