Learning from Sudoku Solvers (2007) (ravimohan.blogspot.com)

Some comments 2 months ago (15 points, 7 comments)

2012 (28 points, 9 comments) https://news.ycombinator.com/item?id=4434744

2010 (65 points, 48 comments) https://news.ycombinator.com/item?id=1221399

Or perhaps just use a language that's designed to solve those sorts of problems? In 14 lines of code.

https://www.swi-prolog.org/pldoc/man?section=clpfd-sudoku

Peter Seibel's original post is worth reading in its entirety.

It's a decently balanced piece. It leaves room for various views, and its summation seems about right.

https://gigamonkeys.wordpress.com/2009/10/05/coders-unit-tes...

I remember implementing some of these

https://www.stolaf.edu/people/hansonr/sudoku/12rules.htm

With a simple array of unsigned int and bit operations like 20 years ago. It could solve a lot of puzzles within microseconds. Later I realized rules 1, 2, 5, 6 are pretty much the same.