I have come across an old article from a dance magazine (do not recall the name of such magazine now) in which is stated that the choreography for Lilac Fairy solo in the prologue as it is now performed by russian ballet companies (i.e.,the one that has the diagonal with sisonne, sisonne, releve, double pirouette from 5th) really belongs to Lopukhov. I do know that Marie Petipa did not dance a choregraphically difficult variation, but that this was later changed when it was danced by better equ