Raphael Collet wrote:
> However the propagation in some examples may indeed reduce generation to
> nothing.  Renaud De Landtsheer wrote a small solver for a Sudoku with
> Regin's alldiff constraint (FD.distinctD).  Surprisingly, search
> (generation) is rarely needed to solve this problem, which suggests that
> this is not really a hard problem ;-)
> http://www2.info.ucl.ac.be/ingidocs/people/rdl/sudoku/solvingsudoku.html

Examples of Sudoku that you typically find in newspaper puzzle columns,
etc. are usually constructed not to require search.

<http://en.wikipedia.org/wiki/Sudoku>

-- 
David Hopwood <[EMAIL PROTECTED]>


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