Need Help - Martial Arts Sudoku, Level 6, #41

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Need Help - Martial Arts Sudoku, Level 6, #41

Postby I Am Bruce » Mon Feb 04, 2008 8:42 pm

This one has been driving me crazy. I can solve it with brute force, but would like to know what logic step I'm missing. Thanks.

Code: Select all
 *-----------------------------------------------------------*
 | 6     2     7     | 159   45    1459  | 1459  3     8     |
 | 4     8     1     | 2579  25    3     | 579   6     259   |
 | 9     3     5     | 1279  6     8     | 1473  129   249   |
 |-------------------+-------------------+-------------------|
 | 25    7     6     | 4     8     1259  | 3     1259  259   |
 | 8     1     3     | 259   7     259   | 59    4     6     |
 | 25    4     9     | 125   3     6     | 8     125   7     |
 |-------------------+-------------------+-------------------|
 | 7     6     2     | 8     1     45    | 459   59    3     |
 | 3     5     4     | 6     9     7     | 2     8     1     |
 | 1     9     8     | 3     245   245   | 6     7     45    |
 *-----------------------------------------------------------

I Am Bruce
 
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Postby daj95376 » Mon Feb 04, 2008 11:51 pm

I don't know where to begin.

You have a Naked 3 and a Naked 9 in row 3, and you haven't eliminated them as candidates elsewhere in row 3.

Your PM did provide some interesting insight into the Simple Sudoku solver. When it loads a PM, it automatically treats all Naked Singles as clues and resolves them. Here's how your PM looks after loading into Simple Sudoku.

Code: Select all
 *-----------------------------------------------------------*
 | 6     2     7     | 159   45    1459  | 1459  3     8     |
 | 4     8     1     | 2579  25    3     | 579   6     259   |
 | 9     3     5     | 127   6     8     | 147   12    24    |
 |-------------------+-------------------+-------------------|
 | 25    7     6     | 4     8     1259  | 3     1259  259   |
 | 8     1     3     | 259   7     259   | 59    4     6     |
 | 25    4     9     | 125   3     6     | 8     125   7     |
 |-------------------+-------------------+-------------------|
 | 7     6     2     | 8     1     45    | 459   59    3     |
 | 3     5     4     | 6     9     7     | 2     8     1     |
 | 1     9     8     | 3     245   245   | 6     7     45    |
 *-----------------------------------------------------------*

From here, you have a bunch of Locked Candidate (1) and Locked Candidate (2) eliminations that can be performed.
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re: Martial Arts Sudoku, Level 6, #41

Postby Pat » Tue Feb 05, 2008 3:27 pm

I Am Bruce wrote:This one has been driving me crazy.
I can solve it with brute force,
but would like to know what logic step I'm missing.

Code: Select all
 6 2 7 | . . . | . 3 8
 4 8 1 | . . 3 | . 6 .
 9 3 5 | . 6 8 | . . .
-------+-------+------
 . 7 6 | 4 8 . | 3 . .
 8 1 3 | . 7 . | . 4 6
 . 4 9 | . 3 6 | 8 . 7
-------+-------+------
 7 6 2 | 8 1 . | . . 3
 3 5 4 | 6 9 7 | 2 8 1
 1 9 8 | 3 . . | 6 7 .



hi I Am Bruce

in box 6, the 1 must be in column 8 --
exclude 1 elsewhere in that column
    this leaves only one possible digit in r3c8
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Thanks

Postby I Am Bruce » Tue Feb 05, 2008 3:38 pm

I don't know how I missed those simple ones. I think I was overthinking the hard ones.
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Joined: 04 February 2008


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