"There are decades where nothing happens," said Lenin. "And there are weeks when decades happen." By the notoriously slow-burning standards of Thoroughbred breeding, however, for Amy Moore it has felt more like a decade when centuries have happened. The way it began, in a sprint maiden at Saratoga on 16 August 2015, could hardly have been less auspicious. The previous September, as she prepared to surface from a 30-year immersion in employee benefits law in Washington D.C., Moore had bought a Blame filly at Keeneland. The idea was that someday...