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Also Nine Men's Morris -- which Wikipedia informs me has been solved (it's a tie).

It also reminds me of games like Fox and Goose and Tafl. I wonder if they are all related.

There's also Pratchet's Thud which is similar to Hnefatafl but has no king piece: https://boardgamegeek.com/boardgame/4532/thud

(Asymmetrical game fans should also look at Ogre https://boardgamegeek.com/boardgame/5206/ogre - one advantage of asymmetrical games is it is very easy to handicap by adding or removing pieces from the side that is "weaker/more numerous")

My preferred descendant of Fox and Geese is Asalto[1]. If you have e.g. a bunch of pennies and two dimes, plus a ruler and a pencil you can draw your own board in under a minutes. It also plays on many solitaire[2] boards.

With practice, the attacker will always win, so you play two rounds, switching roles and see who can win with the fewest losses.

1: https://boardgamegeek.com/boardgame/25988/asalto

2: https://boardgamegeek.com/boardgame/13713/solitaire

Wow, these games are so cool. Thanks for sharing.