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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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 Posted: Mon Dec 04, 2017 8:01 am Post subject: 04-12-2017 |
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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 |
+------------+-------------+--------------+
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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: 1111
Location: Dar es Salaam Tanzania
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| Posted: Mon Dec 04, 2017 8:48 am Post subject: Dec 4 VH |
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| 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 |
+-------------+-------------+---------------+
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XY-Wing 12-3 pivoted in r7c5; r123c6 <> 3; stte |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
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| Posted: Mon Dec 04, 2017 8:50 am Post subject: |
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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
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| Posted: Mon Dec 04, 2017 1:01 pm Post subject: |
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| 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
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| Posted: Wed Mar 07, 2018 3:37 am Post subject: |
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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
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| Posted: Thu Mar 08, 2018 12:07 am Post subject: |
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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
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Mar 08, 2018 12:53 am Post subject: |
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| 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
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| Posted: Fri Mar 09, 2018 12:15 am Post subject: |
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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
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| Posted: Fri Mar 09, 2018 8:07 am Post subject: |
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| 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
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| Posted: Sat Mar 10, 2018 1:09 am Post subject: |
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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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