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APR 28 VH

 
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LloydB



Joined: 09 Jul 2007
Posts: 21
Location: Skagit Co., WA USA

PostPosted: Sun Apr 28, 2013 3:09 pm    Post subject: APR 28 VH Reply with quote

An X wing on 1 in rows 2 and 6 opens up a 478 XY wing centered at R7C1
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jay



Joined: 19 Feb 2013
Posts: 10
Location: Grove, Oklahoma

PostPosted: Mon Apr 29, 2013 6:08 am    Post subject: Reply with quote

Code:

+-------------+--------------+--------------+
| 78  2    16 | 5   167 178  | 9    4  3    |
| 9   14   5  | 2   3   14   | 8    7  6    |
| 378 378  46 | 78  467 9    | 2    5  1    |
+-------------+--------------+--------------+
| 6   1348 14 | 17  5   2    | 347  9  478  |
| 5   9    7  | 4   8   3    | 6    1  2    |
| 348 1348 2  | 6   9   17   | 3457 38 4578 |
+-------------+--------------+--------------+
| 47  6    3  | 9   147 1478 | 157  2  578  |
| 1   5    9  | 378 2   6    | 347  38 478  |
| 2   47   8  | 137 147 5    | 137  6  9    |
+-------------+--------------+--------------+

Play this puzzle online at the Daily Sudoku site

Here is the grid after all the basics that I could find. Lloyd's X wing does not lead to a 478 xy wing from my grid. After some eliminations from the X wing, a strong link of 7s opened up in C5 in Box 8. Then this strong link of 7s in box 8, buddying (on row 9) with the strong link of 7s in Box 7, allows me to eliminate the 7 in R7C6. Then Lloyd's 478 XY wing opened up for me.
This was a tough puzzle.
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arkietech



Joined: 31 Jul 2008
Posts: 1686
Location: Northwest Arkansas USA

PostPosted: Mon Apr 29, 2013 11:21 am    Post subject: Reply with quote

jay wrote:
Code:

+-------------+--------------+--------------+
| 78  2    16 | 5   167 178  | 9    4  3    |
| 9   14   5  | 2   3   14   | 8    7  6    |
| 378 378  46 | 78  467 9    | 2    5  1    |
+-------------+--------------+--------------+
| 6   1348 14 | 17  5   2    | 347  9  478  |
| 5   9    7  | 4   8   3    | 6    1  2    |
| 348 1348 2  | 6   9   17   | 3457 38 4578 |
+-------------+--------------+--------------+
| 47  6    3  | 9   147 1478 | 157  2  578  |
| 1   5    9  | 378 2   6    | 347  38 478  |
| 2   47   8  | 137 147 5    | 137  6  9    |
+-------------+--------------+--------------+

Play this puzzle online at the Daily Sudoku site

Here is the grid after all the basics that I could find. Lloyd's X wing does not lead to a 478 xy wing from my grid. After some eliminations from the X wing, a strong link of 7s opened up in C5 in Box 8. Then this strong link of 7s in box 8, buddying (on row 9) with the strong link of 7s in Box 7, allows me to eliminate the 7 in R7C6. Then Lloyd's 478 XY wing opened up for me.
This was a tough puzzle.


There is a triple in row 3
There is also a skyscraper on 4 in rows 2 and 9 removing the 4 in r3c5 and r7c6 solving the puzzle.
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Mon Apr 29, 2013 1:00 pm    Post subject: Reply with quote

jay wrote:
Code:

+-------------+--------------+--------------+
| 78  2    16 | 5   167 178  | 9    4  3    |
| 9   14   5  | 2   3   14   | 8    7  6    |
| 378 378  46 | 78  467 9    | 2    5  1    |
+-------------+--------------+--------------+
| 6   1348 14 | 17  5   2    | 347  9  478  |
| 5   9    7  | 4   8   3    | 6    1  2    |
| 348 1348 2  | 6   9   17   | 3457 38 4578 |
+-------------+--------------+--------------+
| 47  6    3  | 9   147 1478 | 157  2  578  |
| 1   5    9  | 378 2   6    | 347  38 478  |
| 2   47   8  | 137 147 5    | 137  6  9    |
+-------------+--------------+--------------+

Play this puzzle online at the Daily Sudoku site

Here is the grid after all the basics that I could find. Lloyd's X wing does not lead to a 478 xy wing from my grid. After some eliminations from the X wing, a strong link of 7s opened up in C5 in Box 8. Then this strong link of 7s in box 8, buddying (on row 9) with the strong link of 7s in Box 7, allows me to eliminate the 7 in R7C6. Then Lloyd's 478 XY wing opened up for me.
This was a tough puzzle.


The X-Wing takes out the 1 in r17c6.
Then a 78 pair in r1 takes out the 7 in r1c5.
The 378 triple that Dan mentioned takes out the 7 from r3c5.
Now the only 7s in c5 are in box 8, taking out the 7 from r7c6, leaving 48 in that cell as the third cell needed for the XY-Wing.
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LloydB



Joined: 09 Jul 2007
Posts: 21
Location: Skagit Co., WA USA

PostPosted: Mon Apr 29, 2013 2:41 pm    Post subject: Reply with quote

Perhaps I should have mentioned the several basic moves required between the two VH moves.

It was indeed a tough puzzle - made even harder by the lack of a hint from Dar es Salaam.
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gindaani



Joined: 06 Mar 2009
Posts: 80

PostPosted: Mon Apr 29, 2013 4:32 pm    Post subject: Reply with quote

Skyscraper on 4 in rows 2 and 9 is all that is necessary.
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RobertRattley



Joined: 24 Jun 2007
Posts: 53
Location: Australia

PostPosted: Thu May 02, 2013 9:54 pm    Post subject: Reply with quote

Yes, an excellent puzzle. Lot's of not-very-basic "basics".

I resonate with LloydB's first post, Marty's elaboration, and Lloyd's postcript.

(As always, I solved the puzzle before even looking at this page. But I was a few days behind being able to make an original post. I'm not usually able to consume one puzzle per day on the day of the puzzle, and only rarely can I compete with Dar es Salaam!)

Congratulations to all solvers, including the skyscraper climbers.
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