Earlier, I mentioned finding evidence that the horrible Broadway re-write of Chess was the only version authorized for production in the States. A more recent search has turned up this page, which indicates to the contrary. It looks to be a good broad summary of the history of many productions, and includes the tidbit that "Someone Else’s Story" was inserted at Broadway, and in later versions is given to Svetlana (the Russian’s wife) to sing, rather than Florence.