coan.net: As for an easy variant to add, if Draughts ("International Checkers") is created, is Canadian checkers. It has the same rules as Draughts, except that's it's played on a 12x12 board (with 30 checkers).
Wikipedia has a handy table which lists the differences between the regional draughts/checkers variants, and has links to some "invented" variants.
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