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04-12-2017

 
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Mon Dec 04, 2017 8:01 am    Post subject: 04-12-2017 Reply with quote

Hi everyone
Code:

+------------+-------------+--------------+
| 26  236 69 | 1   4   237 | 5   8   379  |
| 48  1   89 | 5   6   378 | 349 479 2    |
| 458 235 7  | 9   23  238 | 34  6   1    |
+------------+-------------+--------------+
| 18  9   2  | 4   7   6   | 18  3   5    |
| 158 56  3  | 28  129 12  | 7   149 4689 |
| 7   4   68 | 38  139 5   | 2   19  689  |
+------------+-------------+--------------+
| 3   28  5  | 27  12  9   | 6   147 478  |
| 9   68  4  | 367 5   13  | 18  2   78   |
| 26  7   1  | 26  8   4   | 39  5   39   |
+------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site

[2R3C5-(2=1)R7C5 and (2-3)R3C5=3R123C6-(3=1)R8C6]=>contradiction (two singles 1 in box 8 )=>-2R3C5=>Stte.
Ciao a Tutti
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Mon Dec 04, 2017 8:48 am    Post subject: Dec 4 VH Reply with quote

Code:

+-------------+-------------+---------------+
| 26  236  69 | 1   4   237 | 5   8    3679 |
| 48  1    89 | 5   6   378 | 349 479  2    |
| 458 2356 7  | 9   23  238 | 34  46   1    |
+-------------+-------------+---------------+
| 18  9    2  | 4   7   6   | 18  3    5    |
| 158 56   3  | 28  129 12  | 7   1469 4689 |
| 7   4    68 | 38  139 5   | 2   169  689  |
+-------------+-------------+---------------+
| 3   28   5  | 27  12  9   | 6   147  478  |
| 9   68   4  | 367 5   13  | 18  2    78   |
| 26  7    1  | 26  8   4   | 39  5    39   |
+-------------+-------------+---------------+

XY-Wing 12-3 pivoted in r7c5; r123c6 <> 3; stte
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Mon Dec 04, 2017 8:50 am    Post subject: Reply with quote

Hi everyone,

Code:

+------------+-------------+--------------+
| 26  236 69 | 1   4   237 | 5   8   379  |
| 48  1   89 | 5   6   378 | 349 79  2    |
| 458 235 7  | 9   23  238 | 34  6   1    |
+------------+-------------+--------------+
| 18  9   2  | 4   7   6   | 18  3   5    |
| 158 56  3  | 28  129 12  | 7   149 4689 |
| 7   4   68 | 38  139 5   | 2   19  689  |
+------------+-------------+--------------+
| 3   28  5  | 27  12  9   | 6   147 478  |
| 9   68  4  | 367 5   13  | 18  2   78   |
| 26  7   1  | 26  8   4   | 39  5   39   |
+------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 1,2,3 in r37c5,r8c6 and -3 in r123c6
or
XY-Chain r6c4 - 8 - r5c4 - 2 - r5c6 - 1 - r8c6 and -3 in r8c4

Ciao Gianni
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Mon Dec 04, 2017 1:01 pm    Post subject: Reply with quote

I wasn't paying enough attention. I played an M-Wing on 12 in b 58, but after the fact, I see it's a W-Wing with SL 2 in c4.
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mtharp



Joined: 19 Jun 2006
Posts: 30

PostPosted: Wed Mar 07, 2018 3:37 am    Post subject: Reply with quote

I played an X wing on 1 in r67c58, but missed the XY wing. Great elimination.

Looks like I need to look up M-wings also.

Mike
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mtharp



Joined: 19 Jun 2006
Posts: 30

PostPosted: Thu Mar 08, 2018 12:07 am    Post subject: Reply with quote

Marty, I could not find the W-wing. If you would, please spell it out for me.

I have looked up M-wings and your instruction with respect to this puzzle would be helpful.

Thanks for your time and consideration.

Mike
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Thu Mar 08, 2018 12:39 am    Post subject: Reply with quote

Mike,

Yo can start here:

http://www.dailysudoku.com/sudoku/forums/viewtopic.php?t=2143

In the Solving Techniques section there are a number of threads on M- and W-wings.

Helmut's Sudoku Helper does a nice job of identifying and diagramming them.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Thu Mar 08, 2018 12:53 am    Post subject: Reply with quote

Quote:

Marty, I could not find the W-wing. If you would, please spell it out for me.


Well, note the 12 cells in b5&8. They are connected by the strong link on 2 in c4.
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mtharp



Joined: 19 Jun 2006
Posts: 30

PostPosted: Fri Mar 09, 2018 12:15 am    Post subject: Reply with quote

Keith, thank you. I am still trying to absorb.

Marty, help me understand the strong link on 2 in c4. It looks like to me that there are 3 occurrences of 2 in c4. I thought that a strong link had to have only two occurrences in a house (in this case c4).

Mike
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Mar 09, 2018 8:07 am    Post subject: Reply with quote

mtharp wrote:
Keith, thank you. I am still trying to absorb.

Marty, help me understand the strong link on 2 in c4. It looks like to me that there are 3 occurrences of 2 in c4. I thought that a strong link had to have only two occurrences in a house (in this case c4).

Mike


Mike,

This had me laughing, because I posted the same concern after I learned about the W-Wing. Those three 2s operate as a strong link since there either is a 2 in b5 or one in b8.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Mar 10, 2018 1:09 am    Post subject: Reply with quote

I am grinning, too.

A little bit of history:

Someone told me I should have been a Professor. Well, I was for a while.

I have a learning style: I don't think I adequately understand something until I can explain it to someone else. That's why I have written all these tutorials. More or less, to logically explain it to myself.

The history is that George Woods first noticed a pattern in the Daily Sudoku puzzles. I documented it, and called it a W-wing in honor of George.

About the same time, I noticed that Medusa Coloring could also result in short chain eliminations. I figured that out, and called them M-wings because of Medusa, but also, M is the initial of my surname.

That all led to the "remote pairs" post referenced above.

Keith
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