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Peter Norvig
Re: Solving Every Sudoku Puzzle - http://www.norvig.com/sudoku...
"Thanks to the pointer.  People who want a very efficient Sudoku solver should indeed look at the dancing links algorithm, and other methods of implementing the all-different constraint in CSP.  But for this article, I was going for the simplest reasonable method, not the most efficient.  I'll have an article coming out in Code Quarterly soon that goes into more detail on efficiency; it is paired with an article covering dancing links." - Peter Norvig