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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) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)