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to bwildman: No reason for that. Because I am just about to write such an engine, I tend to use such criteria to characterize variants. It is clear that most people would use very different approaches to group or separate chess variants.
(hide) In the mood for a quick game that is guaranteed to finish within 2 hours? Create a new game of your preference, select the Time for game and set Time to 0 days / 1 hour, Bonus to 0 days / 0 hours and Limit to 0 days / 1 hours. (TeamBundy) (show all tips)