I would start with something dead simple: material difference. Which is equal to: (# of my checkers on board) - (# of checkers of opponents on board). Then you can add additional functions and start weighing them, for example, “the number of checked drafts”, “# protected drafts” or, possibly, “the number of squares controlled in the middle of the board”, etc. Talk to a domain expert (i.e., the Drafts Player) and / or refer to the drafts book to find out what will work well.
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