given that java has beaten us with some 60 bytes: http://programming.reddit.com/info/9xha/comments/c9y8b and in order to further improve Python's Kolmogorov rating: http://en.wikipedia.org/wiki/Kolmogorov_complexity how about adding Peter Norvig's constraint-based solver to the Python library: http://www.norvig.com/sudoku.html ? Anthony ? ("import this;this.suduko()" is 25 characters, and we could always optimize this a bit more in Python 2.6, if needed). [\F]