a Sudoku x

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a Sudoku x

Postby sarker306 » Wed Mar 11, 2009 5:48 pm

I am facung trouble with these 12 clued by RUUD
400003000050000020000000600000030000500004312034500000263475000845000237000300456
000004001040000000000000004000040000000701042304528009628457003000812456415000007
is where i stoped.
Any suggestion?
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Re: a Sudoku x

Postby daj95376 » Wed Mar 11, 2009 6:39 pm

sarker306 wrote:I am facung trouble with these 12 clued by RUUD
400003000050000020000000600000030000500004312034500000263475000845000237000300456
000004001040000000000000004000040000000701042304528009628457003000812456415000007
is where i stoped.
Any suggestion?

Are you sure these weren't presented as Sudoku-X puzzles. I believe that variant doesn't need 17 clues to be unique.
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Re: a Sudoku x

Postby sarker306 » Wed Mar 11, 2009 8:03 pm

The puzzles are of the top 10 in ruud's 12 clued sudoku x. I m sure.
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Re: a Sudoku x

Postby tarek » Thu Mar 12, 2009 12:12 am

sarker306 wrote:I am facung trouble with these 12 clued by RUUD
400003000050000020000000600000030000500004312034500000263475000845000237000300456
000004001040000000000000004000040000000701042304528009628457003000812456415000007
is where i stoped.
Any suggestion?
I suggest that when you attempt to solve an UNRATED puzzle or an UNSOURCED puzzle, that you rate them using a reputable computer solver first. This will check for a unique solution & will give you a rough idea of what you are dealing with.

You can try Ruud's own Sudocue which supports SudokuX as well

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Postby udosuk » Thu Mar 12, 2009 2:11 am

The 2nd puzzle is a valid Sudoku X, but it (probably) needs extensive chains/nets to solve.

The 1st puzzle is not valid (no solution with the X property). Please provide a link of the original source so that we can check if there is any typo there.

Added later:

Regarding the 1st puzzle, I think you have made a mistake in placing a 6 in r3c7. Without that the puzzle has a unique solution under the X property.:idea:
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