Much better than some of the garbage solutions I have seen, including from sources that should know better, like The Algorithm Design Handbook. Some really absu

Much better than some of the garbage solutions I have seen, including from sources that should know better, like The Algorithm Design Handbook. Some really absurd approaches out there, so bad I wrote a blog post about it in 2015: https://www.grahamwheeler.com/post/sudoku/ https://www.grahamwheeler.com/post/sudoku/