Merels
AKA Morris Games
One of the most common games in history; not written down as much as one might wish, but boards appear in a wide variety of cultures. Most commonly known as Nine Men's Morris, but that's actually just one of a family.
Variants
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Three Men's Morris -- The smallest game in the Merels family, sort of a more-interesting version of Tic-Tac-Toe.
Reconstructions and Other Discussions