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I see the 7, now why a 3?

 
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pat1m



Joined: 17 Jul 2006
Posts: 6
PostPosted: Thu Aug 31, 2006 10:39 pm    Post subject: I see the 7, now why a 3? Reply with quote
Here is another one I am stuck on.

Code:

+-------------------------+-----------------------+-----------------+
| 1268    168     12678   | 13678    18       4   | 238    5    9   |
| 4       9       568     | 368      2        356 | 38     1    7   |
| 3       158     12578   | 178      1578     9   | 4      6    28  |
+-------------------------+-----------------------+-----------------+
| 7       2       18      | 9        6        15  | 58     4    3   |
|168      3       4       | 18       158      2   | 9      7    568 |
| 5       68      9       | 4        3        7   | 68     2    1   |
+-------------------------+-----------------------+-----------------+
| 168     1568    13568   | 2        79       1368| 1567   39   4   |
| 9       7       12356   | 136      4        136 | 1256   8    256 |
| 1268    4       12368   | 5        79       1368| 1267   39   26  |
+-------------------------+-----------------------+----------------+

The next move is supposed to be a 3 in r2c7. Please explain.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Sep 01, 2006 12:22 am    Post subject: Re: I see the 7, now why a 3? Reply with quote
pat1m wrote:
Here is another one I am stuck on.

Code:

+-------------------------+-----------------------+-----------------+
| 1268    168     12678   | 13678    18       4   | 238    5    9   |
| 4       9       568     | 368      2        356 | 38     1    7   |
| 3       158     12578   | 178      1578     9   | 4      6    28  |
+-------------------------+-----------------------+-----------------+
| 7       2       18      | 9        6        15  | 58     4    3   |
|168      3       4       | 18       158      2   | 9      7    568 |
| 5       68      9       | 4        3        7   | 68     2    1   |
+-------------------------+-----------------------+-----------------+
| 168     1568    13568   | 2        79       1368| 1567   39   4   |
| 9       7       12356   | 136      4        136 | 1256   8    256 |
| 1268    4       12368   | 5        79       1368| 1267   39   26  |
+-------------------------+-----------------------+----------------+

The next move is supposed to be a 3 in r2c7. Please explain.


First, there's a "7" in c5 which shouldn't be because of the "79" pair.

Look at box 5. The "8" must go in row 5, which eliminates the "8" in r5c9, leaving r3c9 as the only "8" in c9. Thus, the "3" is left standing in r2c7 after the "8" is eliminated.
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pat1m



Joined: 17 Jul 2006
Posts: 6
PostPosted: Fri Sep 01, 2006 12:36 am    Post subject: Reply with quote
Thank you for pointing out the answer.
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