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H. G. Muller wrote on Sun, Oct 26, 2008 07:05 PM UTC:
Joker80 has an official license to play this variant, and complies with the condition to print the patent number and holder when this variant is selected. So no problem there. I always contact patent holders to inquire how they feel about me implementing their variants. I did the same for Falcon Chess, and also there it was no problem. I feel that I owe this to the inventors out of respect for their intellectual property. Even in cases where I would not strictly need their permission by legal standards, because the patent does not cover my part of the world, or because they failed to pay their patent fees.