sentences:  It presents a stern challenge for inexperienced horses and a true test of stamina for those that might previously have contested the 2,000 Guineas Stakes over a mile (1600 m).Unusually, the racecourse is not a circuit but is roughly "U"-shaped with chutes for the start of sprint races over five, six and seven furlongs.The Derby course features an ascent to the top of the hill followed by a wide, sweeping left turn (Tattenham Corner) as the horses descend towards the straight.