I became interested in Sudoku solving recently, and although I was aware of this essay, I wanted to study the problem first without knowing anything about const

I became interested in Sudoku solving recently, and although I was aware of this essay, I wanted to study the problem first without knowing anything about constraint propagation: http://cjauvin.blogspot.com/2011/10/journey-into-sudoku-space.html http://cjauvin.blogspot.com/2011/10/journey-into-sudoku-spac... Next I read the article, and then tried to adapt my previous, naive method with the CP ideas: http://cjauvin.blogspot.com/2011/10/wormhole-through-sudoku-space.html http://cjauvin.blogspot.com/2011/10/wormhole-through-sudoku-...