A Concours Hippique International Officiel (CHIO) (from French, meaning "Official International Equestrian Competition") is an FEI-sanctioned horse show with international-level competitors in equestrian sports such as show jumping, dressage, eventing, and combined driving.
It is held in Aachen, Germany at the 40,000 spectator capacity stadium Hauptstadion in the Soers Sports Park complex.
The event is popular in Europe for its Grand Prix show jumping and dressage.
[1][2][3][4][5] From its early start of a riding school horse show in 1937, and its relaunch after World War II in 1947, CHIO Rotterdam quickly grew into an international-level equestrian competition.
Since 1948, the event has been held at the Kralingse Bos [nl] and its biggest draw is the show jumping and dressage competitions.