How do Sudoku setters know they have filled just enough squares to give a unique solution?
Well i would think that making a sudoku is just as hard as doing one. I would think they start with a solution, all the squares filled, and carefully work backwards finding all possible leads. There must be a systematic approach and a computer program that creates soduko’s. I was going to try to program one when i was in programming, but found it way too big of a project. Found your question interesting enough, and maybe this site can help answer your question. My approach was obviously not the way they do it here. http://www.sudokuonline.us/make_your_own… I didnt read it all.
