The New Sudoku Players' Forum

[Bernard Stay]

Stumped by this:

3*8|9*5|*6*
***|37*|**8
5**|***1**
——————
78*|6**|**9
*5*|***|*1*
6**|**2|*57
——————
**2|***|**5
1**|*48|***
*6*|7*9|4*1

Can take it a fair way easily. Then no X-wings, swordfishes, twos, threes or fours etc.. Sudoku Susser (Mac) can only solve by citing something called a "deadly pattern" that has to be avoided.

Any comment?

Thanks.

[wintder]

Code: Select all

3 . 8|9 . 5|. 6 .
. . .|3 7 .|. . 8
5 . .|. . .|1 . .
-----+-----+-----
7 8 .|6 . .|. . 9
. 5 .|. . .|. 1 .
6 . .|. . 2|. 5 7
-----+-----+-----
. . 2|. . .|. . 5
1 . .|. 4 8|. . .
. 6 .|7 . 9|4 . 1

This puzzle has one x-wing and nothing harder is needed.

Code: Select all

.------------------.------------------.------------------.
| 3    *247   8    | 9     1     5    |*27    6     24   |
| 49    1249  1469 | 3     7     46   | 5     249   8    |
| 5     49-7  4679 | 2     8     46   | 1     479   3    |
:------------------+------------------+------------------:
| 7     8     34   | 6     5     1    | 23    24    9    |
| 2     5     349  | 48    39    7    | 368   1     46   |
| 6     1349  1349 | 48    39    2    | 38    5     7    |
:------------------+------------------+------------------:
| 49   *479   2    | 1     6     3    |*79    8     5    |
| 1     39-7  379  | 5     4     8    | 269-7 27    26   |
| 8     6     5    | 7     2     9    | 4     3     1    |
'------------------'------------------'------------------'

[Bernard Stay]

Thanks wintder. I have operated that X-wing and then get to:-

3*8|915|*6*
***|37*|5*8
5**|28*1*3
....................
78*|651|**9
25*|**7|*1*
6**|**2|*57
.....................
**2|163|*85
1**|548|***
865|729|431

What do I do now?

[Bernard Stay]

If it helps here's my effort to date with all alternatives shown:-

3 247 98|9 1 5|27 6 24
94 1249 1469|3 7 46|5 249 8
5 49 4697|2 8 46|1 479 3
...............................................
7 8 34|6 5 1|23 24 9
2 5 349|48 39 7|368 1 46
6 1349 1349|48 39 2|38 5 7
................................................
49 497 2|1 6 3|79 8 5
1 39 379|5 4 8|269 27 26
8 6 5| 7 2 9|4 3 1

I really would like some help here how to proceed. Anybody?

Thanks.

[ArkieTech]

Bernard Stay said

I really would like some help here how to proceed. Anybody?

Look for a naked pair in block 1

dan

[Bernard Stay]

Thanks Dan. It's amazing how you can stare at something until nearly blind and still miss something so blindingly obvious. Dear oh dear!