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Announcements: 450 impossible Sudoku games!

Title

450 impossible Sudoku games! 

Body

Gordon Royle's 450 Sudoku games with only 17 hints in the schema and unique solution:
 

Expires

1/1/2012 
Attachments
Created at 7/7/2005 14:37  by Antonio Cisternino 
Last modified at 1/15/2012 23:40  by Antonio Cisternino