[The Ace]

It resonates with a book called something like, 'Glory Ice,' but I can't find anything about it on the web and don't remember the author.

The game was mainly played by lower-caste males iirc, in a matriarchal society. If it's the same book, the lead and her sister were naturally-born twins (they had a long absent father), and thus looked different from their, 'Sisters,' at home who were cloned.