Its only 10$ and you might see some negative reviews, but those launch issues have been resolved. Its a really interesting variant. It has a great friends list system with correspondence options so you can always find games.
Check this new Chess game out!
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"Chess 2: The Sequel" is out on Steam. I have never played any other chess variants other than 960, but I really loved this game. I recommend googling it. You can buy it online.
http://ludemegames.com/chess2/