Royal Opera House, LondonMarianela Nuñez and Natalia Osipova take turns playing one of classical dance's most unconventional heroines, in the Royal Ballet's opulent Arcadian fantasyWomen play an unusually sparky role in Sylvia, the 1952 ballet with which Frederick Ashton brought Léo Delibes's shimmering 19th-century score to the British stage. From the first entrance of Sylvia and her fellow huntresses, triumphan…
