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SUDOKU

Newspapers have been publishing sudoku puzzles. To find out more about sudoku look at the links at the end of the page.
Here is a Sudoku puzzeAnd here is the solution
 1              6          
 4           8     1       
       9     2  3     5    
       4     6  7  8       
 5     7              3  4 
    9              5       
    4     6     8     1    
    7     9  1             
       2           6  7    
 1  2  3  4  5  6  7  8  9 
 4  5  6  7  8  9  1  2  3 
 7  8  9  1  2  3  4  5  6 
 2  3  4  5  6  7  8  9  1 
 5  6  7  8  9  1  2  3  4 
 8  9  1  2  3  4  5  6  7 
 3  4  5  6  7  8  9  1  2 
 6  7  8  9  1  2  3  4  5 
 9  1  2  3  4  5  6  7  8 
  1. Wikipedia Article
  2. A Good introduction by Zhou Fang
  3. Sudoku made difficult
  4. Program scripts
  5. Sample data file
  6. The Guardian: source of some examples
  7. Terry Ritter's Historical Survey of Latin Squares
To run the script you should download the run time system.
It has been necessary to modify the source code for newer versions of Linux gcc. In addition math2549.tgz contains new routines for multiple precision arithmetic. Large integers may be several thousand digits long and all arithmetic works reasonably with positive and negative numbers.

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