The Clarence House Chase, Ascot, is a Grade 1 race that allows horses of at least five years old to enter. It takes place over two miles and one furlong, with thirteen fences in total needing to be jumped.
It usually takes place in January and was first run was to take place in 1987, but it ended up being cancelled as a result of fog. In its beginning years, it was a handicap race and it was over two miles.
With Ascot being redeveloped in 2005 and 2006, the Clarence House Chase took place at other venues. It got bumped to a Grade 1 race in 2007 and was no longer a handicap race.
It is known as being a good form race for the Queen Mother Champion Chase, with many horses winning the Clarence House Chase before going onto claim the Queen Mother that same year. Un de Sceaux is the most successful horse in the Clarence House Chase with three successive wins.