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Reliance was based in England for his stud career, standing at the Harwood Stud in Newbury, Berkshire. He had his greatest success as a sire of stayers, with his progeny including Proverb (Chester Vase, Goodwood Cup, Doncaster Cup), Recupere (Prix du Cadran) and Tug of War (Goodwood Cup). He was also the sire of the broodmare Doubly Sure, the dam of Kris and Diesis. Other daughters produced the champion sprinter Moorestyle, the Ascot Gold Cup winner Longboat and the St. James's Palace Stakes winner Persian Heights. Reliance was euthanised in August 1979 after suffering from a chronic sinus condition.