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Michael, you don't need to bother about such copyrights. Nobody has the right to copyright the properties of chess that have existed for thousands of years. If I design a TV, with an inbuilt digital camera, and cellular phone, then I can't copyright that, simply because of insufficient uniqueness. It's just a juxtaposition of already invented items. When it comes to chess, it has such a strong public domain status, like all ancient games, so in this case it's even more obvious that it can't be copyrighted. Anybody can exploit my Mammoth Chess anyway they want. (I uploaded a bugfixed version today). If it becomes popular then they might want to fabricate Mammuth piece sets and sell. I gladly accept that.