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Trouble finding naked pair 5/8 and understanding

 
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gpdub



Joined: 15 Feb 2017
Posts: 1
PostPosted: Wed Feb 15, 2017 3:22 pm    Post subject: Trouble finding naked pair 5/8 and understanding Reply with quote
Code:

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

Play this puzzle online at the Daily Sudoku site
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Wed Feb 15, 2017 5:03 pm    Post subject: Reply with quote
Hi gpdub,
I'm not sure I understand your question.
If you search the naked pair I point you,under, the cells that contain only the numbers 5,8.

Ciao Gianni.

Quote:
only a 5 and 8 are possible for the cells r4c3-r4c4
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Thu Feb 16, 2017 10:08 am    Post subject: Re: Trouble finding naked pair 5/8 and understanding Reply with quote
gpdub wrote:
Code:

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


Code:
 *--------------------------------------------------------------------*
 | 4      5      9      | 3      8      7      | 6      2      1      |
 | 368    68     1      | 4      9      2      | 37     378    5      |
 | 368    2      7      | 56     1      56     | 39     4      389    |
 |----------------------+----------------------+----------------------|
 | 1-58   19-8   58     | 58     37     4      | 2      379-58 6      |
 | 568    3      2      | 568    67     569    | 579    1      4      |
 | 7      689    4      | 1      2      3569   | 359    3589   389    |
 |----------------------+----------------------+----------------------|
 | 9      4      36     | 7      5      1      | 8      36     2      |
 | 2      678    3568   | 9      4      36     | 1      3567   37     |
 | 1356   167    356    | 2      36     8      | 4      35679  379    |
 *--------------------------------------------------------------------*


row 4 has a pair 58 in r4 column 34 (58r4c34)
since row 4 can only have one 5 and one 8 all other 5s and 8s can be removed.
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czerwiec



Joined: 20 Jun 2017
Posts: 3
PostPosted: Tue Jun 20, 2017 9:34 pm    Post subject: Reply with quote
I love sudoku!!! And I love this forum. I learning so much!
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