sudoku

Quoted: 100000 grilles de sudoku puzzle,enfant,Daily Sudoku Puzzle.Téléchargez des grilles de kakuro,mots croisés et mots fléchés et des jeux de réflexions.

Mike was asking how many essentially different sudoku grids there are. Here's the answer...

Interesting article on rating the difficulty of Sudoku's and various solving methods (including a short backtracking program written in Ruby).

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I've been thinking about explicit logic strategies for my solver - this site has some explanations I haven't seen before (X-Wing) and (Sword-Fish) - though I've used the former in manual solves.

Quoted: Sudoku Solver by Scanraid Ltd. Shows the logic behind solving Sudoku square by square.

My friend Roy's new puzzle book. You can pre-order from Amazon now.

Quoted: Amazon.com: Who-doku: Sudoku with Personality: Books: Roy Leban by Roy Leban

This is pretty cool, except I want them to list the algorithm... I'm really curious what they came up with here...

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July 2005 paper describing a graph-based algorithm applicable to Sudoku puzzles.

Quoted: We apply our path and cycle finding algorithms in a program for generating and solving Sudoku puzzles, and show experimentally that they lead to effective puzzle-solving rules that may also be of interest to human Sudoku puzzle solvers.

Quoted: In order to celebrate the new year, we are going to publish in PrintSudoku small books with 25 sudokus each one, grouped by levels and in pdf :-).