Alternation IS winnable!!!
I'm a person who's been playing anonymously for years and was getting tired of how quickly I'd go through FreeCell games. (The only game I know how to play.) So, when someone mentioned Alternation in a message (I read messages but don't ever answer) and made it sound like it was easy to play but impossible to win (I'm just looking for something to kill time), I thought I'd try it.
It took me five days going through game after game (and, as you can see from the screen shot I wasn't the only one to win) but I finally DID get a victory!
So to whoever that was (sorry, I can't remember) thank you for saying where to find it. (And I didn't beat my head against the wall, just kept trying.) It's very interesting, and since it takes longer to play, I think I'll stick with it for a while.
And thank you Jim and David for keeping this site running. Between this and jigsaw puzzles, I can keep entertained for hours. (I'm been mostly bedridden for the last year and a half, so I play a LOT!)