High Quality Content by WIKIPEDIA articles! The Racing Post Trophy is a Group 1 flat horse race in Great Britain which is open to two-year-old thoroughbred colts and fillies. It is run at Doncaster over a distance of 1 mile (1,609 metres), and it is scheduled to take place each year in late October. The event was established in 1961, and it was originally called the Timeform Gold Cup. It was founded by Phil Bull, the creator of Timeform, and it was backed by this organisation until 1964. The race's next sponsor was The Observer, which began supporting the event in 1965. When the present system of race grading was introduced in 1971, the Observer Gold Cup was classed at the highest level, Group 1.