For those of you who want to try playing Gothic Chess, I can recommend the free version of Ed Trice's Gothic Vortex program, "Gothic Vortex Copper", which can be downloaded from here:
http://www.freedownloadscenter.com/Games/Board_Games/Gothic_Vortex.html
I liked the program a lot, it was very intuitive and easy to use. I'm not too sure about the game itself.