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Re: Sudoku puzzle

Having found this thread on sudoko only after it was "finished", I still 
have two (related) questions:

(i) how to provide a partially filled-in sudoku such that the solution 
is uinique? (how many positions must be filled in, and which)

(ii) how is the degree of difficulty (simple, average, hard) of a sudoku 

Both questions must have been answered internally by the magazines 
providing sudokus.


Mike Honeychurch wrote:

> Many readers would be aware that Sudoku is a puzzle (craze) that has
> recently appeared in many major newspapers around the world as a regular
> puzzle.
> (See and
> An open source sudoku project exists with a Java applet available at
> sourceforge:
> Mathematica in Education and Research would like to issue a challenge to the
> Mathematica community to create a Mathematica version of Sudoku: a package
> that both creates Sudoku puzzles and solves them (either totally within a
> notebook or via the GUI interface).
> Please submit your Sudoku version as an article for Mathematica in Education
> and Research describing the code and the (presumed?) challenges faced and
> overcome in writing the code.
> Michael Honeychurch
> Mathematica in Education and Research

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