Telika: And, well, I love it, but it's basically a light "chessmaster tutorial/training" with a nice flavor. Much more linear than it looks like. Gameplay-wise, you get the very same thing by going through chessmaster academy chapters. But the nice flavor (working basically like a skin for academy chapters) does make a difference for me, it works for childish reasons.
Just don't expect a real rpg/adventure with chessfights.
Thanks for the tips, I suppose it's originality alone is enough for me to buy it if it ever appears in the GOG catalogue.
To chess fans, I really recommend
WinBoard. It's free, and it's superb!