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On self-driving, Waymo is playing chess while Tesla plays checkers
(arstechnica.com)
This is a most excellent place for technology news and articles.
My point is that checkers actually still is very mich complex. Tictactoe is not and every board position can reasonably be managed by a human.
With checkers, that is unfeasable. That's why I am of the opinion that checkers is unfairly treated as "the simple game" when for humans it is far from simple.