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Jan 26 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania
PostPosted: Tue Jan 26, 2016 8:19 am    Post subject: Jan 26 VH Reply with quote
Code:

+---------------+---------------+--------------+
| 47   479  1   | 8    6   2    | 3  5    4-9   |
| 8    369  36  | 4    59  135  | 7  19   2    |
| 34   2    5   | *139  7   13   | 8  46   *1469 |
+---------------+---------------+--------------+
| 9    356  8   | 7    1   456  | 2  346  456  |
| 1    3567 367 | 2    45  8    | 59 3467 456-9 |
| 2    567  4   | 56   3   9    | 1  67   8    |
+---------------+---------------+--------------+
| 3457 347  37  | *1359 8   1345 | 6  2    *1579 |
| 456  8    2   | 156-9 459 7    | 59 19   3    |
| 3567 1    9   | 356  2   356  | 4  8    57   |
+---------------+---------------+--------------+

X-Wing on 9 in r37; r8c4, r15c9 <> 9; stte
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK
PostPosted: Tue Jan 26, 2016 11:05 am    Post subject: Re: Jan 26 VH Reply with quote
Clement wrote:
X-Wing on 9 in r37; r8c4, r15c9 <> 9; stte

Well spotted Clement. But I could never learn to like the few
'one X wing and that's it' puzzles, hard to spot yet very unsatisfying somehow.
Perhaps better is the really easy to see W wing on 59s r2c5 r8c7 using the
19s in c8 setting r2c5 to9 stte.
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yeoks



Joined: 16 May 2010
Posts: 33
PostPosted: Tue Jan 26, 2016 12:12 pm    Post subject: Reply with quote
Code:

+---------------+---------------+--------------+
| 47   479  1   | 8    6   2    | 3  5    49   |
| 8    369  36  | 4    59  135  | 7  19   2    |
| 34   2    5   | 139  7   13   | 8  46   1469 |
+---------------+---------------+--------------+
| 9    356  8   | 7    1   456  | 2  346  456  |
| 1    3567 367 | 2    45  8    | 59 3467 4569 |
| 2    567  4   | 56   3   9    | 1  67   8    |
+---------------+---------------+--------------+
| 3457 347  37  | 1359 8   1345 | 6  2    1579 |
| 456  8    2   | 1569 459 7    | 59 19   3    |
| 3567 1    9   | 356  2   356  | 4  8    57   |
+---------------+---------------+--------------+

Play this puzzle online at the Daily Sudoku site

Another X-Wing on 9 in c58; r2c2, r8c47<>9 also does it
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jan 26, 2016 4:52 pm    Post subject: Reply with quote
Quote:
Perhaps better is the really easy to see W wing on 59s r2c5 r8c7 using the
19s in c8 setting r2c5 to9 stte.




Code:

+---------------+---------------+--------------+
| 47   479  1   | 8    6   2    | 3  5    49   |
| 8    369  36  | 4    59  135  | 7  19   2    |
| 34   2    5   | 139  7   13   | 8  46   1469 |
+---------------+---------------+--------------+
| 9    356  8   | 7    1   456  | 2  346  456  |
| 1    3567 367 | 2    45  8    | 59 3467 4569 |
| 2    567  4   | 56   3   9    | 1  67   8    |
+---------------+---------------+--------------+
| 3457 347  37  | 1359 8   1345 | 6  2    1579 |
| 456  8    2   | 1569 459 7    | 59 19   3    |
| 3567 1    9   | 356  2   356  | 4  8    57   |
+---------------+---------------+--------------+


Hugh, I'm confused, as I often am. With the strong link on 9 in c8 connecting the two 59 cells, that means pincer is 5 and the only direct elimination I see is -5r8c5. I don't see how r2c5 would be=9.
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK
PostPosted: Wed Jan 27, 2016 10:09 am    Post subject: Reply with quote
Marty R. wrote:

Hugh, I'm confused, as I often am. With the strong link on 9 in c8 connecting the two 59 cells, that means pincer is 5 and the only direct elimination I see is -5r8c5. I don't see how r2c5 would be=9.


You're not confused Marty, just correct.

Hugh
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dongrave



Joined: 06 Mar 2014
Posts: 564
PostPosted: Wed Jan 27, 2016 9:24 pm    Post subject: Reply with quote
I found yeoks X-Wing but only after systematically checking the numbers one by one; column by column. Since I found one, I didn't get to the one that Clement found because I would have (hopefully) found it when I systematically went through the numbers one by one; row by row. Do you experts have an easier way to find these darn things or do you use the same systematic approach? (ugh.) I usually have a tougher time finding them than I do XY or XYZ-Wings (or even URs). These things can be tough to spot! Thanks in advance, Don.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Jan 28, 2016 5:05 am    Post subject: Reply with quote
I played the X-Wing. I never liked looking for them,. It's going row by row or column by column, noting the strong links and checking other rowos/columns.
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