[willvarfar]

I know I'm late to the party, but why isn't everyone mentioning Ron Jeffries infamous TDD Sudoku as a comparison?

A lot of the links are dead these days, I'm afraid, but back in 2007 this was the kind of thing that everyone on HN knew about!

http://ravimohan.blogspot.com/2007/04/learning-from-sudoku-s...