Hardest SuDoku

Everything about Sudoku that doesn't fit in one of the other sections

Hardest SuDoku

Postby SuDokuKid » Mon Nov 07, 2005 10:25 pm

Has there been a puzzle realized as the hardest SuDoku puzzle every published? Can someone post it?
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Postby rubylips » Tue Nov 08, 2005 12:56 am

The following puzzle, which is certainly tougher than the 'Toughest-Ever Puzzle' discussed elsewhere on this forum, has provoked plenty of debate on the Sudoku Programmers forum recently:

Code: Select all
 6 . . | . 4 . | . . 3
 . 1 . | . . . | . 7 .
 . . 5 | . . . | 8 . .
-------+-------+------
 . . . | 5 . 2 | . . .
 3 . . | . 9 . | . . 2
 . . . | 1 . 3 | . . .
-------+-------+------
 . . 8 | . . . | 9 . .
 . 7 . | . . . | . 5 .
 2 . . | . 3 . | . . 4
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Postby udosuk » Tue Nov 08, 2005 3:41 pm

This is the most elegant diabolic normal sudoku I've ever seen. 21 clues in such nice symmetric pattern! Deserve to enter the "Sudoku Hall of Fame"!
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Postby SuDokuKid » Tue Nov 08, 2005 4:30 pm

What's the discussion about? Is there only one solution for this?
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Postby Wolfgang » Tue Nov 08, 2005 6:13 pm

Yes, if you want to solve it manually, just guess that r9c2 is 6, the rest is easy:)
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