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Jan 18 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 65
Location: Sweden

PostPosted: Wed Jan 18, 2012 7:39 am    Post subject: Jan 18 VH Reply with quote

Where is Clement?
The xy-wing 169 with pivot at r2c9 solved it for me.
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Rocky Mozell



Joined: 28 Jul 2010
Posts: 21
Location: Boston, MA

PostPosted: Wed Jan 18, 2012 3:38 pm    Post subject: Reply with quote

I had a skyscraper on 9 in boxes 2 and 3.
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Marty R.



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

PostPosted: Wed Jan 18, 2012 5:43 pm    Post subject: Reply with quote

Rocky Mozell wrote:
I had a skyscraper on 9 in boxes 2 and 3.

Rocky, I wasn't able to get rid of the 9 in r1c1.

Code:

+-------------+---------+-----------+
| 459 45  8   | 3  1 69 | 7  2  569 |
| 6   3   19  | 2  5 7  | 48 48 19  |
| 125 57  127 | 8  4 69 | 69 15 3   |
+-------------+---------+-----------+
| 7   2   6   | 5  9 18 | 3  18 4   |
| 14  8   14  | 7  6 3  | 5  9  2   |
| 3   9   5   | 4  2 18 | 68 7  16  |
+-------------+---------+-----------+
| 249 46  249 | 69 8 5  | 1  3  7   |
| 59  567 79  | 1  3 2  | 49 46 8   |
| 8   1   3   | 69 7 4  | 2  56 59  |
+-------------+---------+-----------+

Play this puzzle online at the Daily Sudoku site
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eddieg



Joined: 12 Jan 2006
Posts: 47
Location: San Diego, CA USA

PostPosted: Wed Jan 18, 2012 8:27 pm    Post subject: Reply with quote

From above sample, see the 69 and 19 in Box 3, and the 16 in Box 6. Makes an easy XYZ-Wing that eliminates the 6 in R6C7, and then the rest falls into place.

I don't even know what a skycrapper is. I am able (sometimes it takes a while) to finish all of the VH puzzles with basic moves.
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Wed Jan 18, 2012 10:07 pm    Post subject: Reply with quote

eddieg wrote:
From above sample, see the 69 and 19 in Box 3, and the 16 in Box 6. Makes an easy XYZ-Wing that eliminates the 6 in R6C7, and then the rest falls into place.
Code:
+-------------+---------+-----------+
| 459 45  8   | 3  1 69 | 7  2  569 |
| 6   3   19  | 2  5 7  | 48 48 19  |
| 125 57  127 | 8  4 69 | 69 15 3   |
+-------------+---------+-----------+
| 7   2   6   | 5  9 18 | 3  18 4   |
| 14  8   14  | 7  6 3  | 5  9  2   |
| 3   9   5   | 4  2 18 | 68 7  16  |
+-------------+---------+-----------+
| 249 46  249 | 69 8 5  | 1  3  7   |
| 59  567 79  | 1  3 2  | 49 46 8   |
| 8   1   3   | 69 7 4  | 2  56 59  |
+-------------+---------+-----------+

Good spot, that does it. I don't think it's called an xyz-wing unless all three digits appear in that central pivot cell.

That there is an xy-wing, shortest possible xy-chain.

Quote:
I don't even know what a skycrapper is.

A skyscraper ( only one "p" Smile ) is a single digit technique using the same basic notion as your xy-wing. Click here for the Sudopedia article.
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Rocky Mozell



Joined: 28 Jul 2010
Posts: 21
Location: Boston, MA

PostPosted: Fri Jan 20, 2012 3:17 pm    Post subject: Reply with quote

Rocky, I wasn't able to get rid of the 9 in r1c1.

Neither was I. What a dope.
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TerenceF



Joined: 21 Dec 2007
Posts: 17
Location: Takapuna, NZ

PostPosted: Mon Jan 23, 2012 12:14 am    Post subject: Reply with quote

Similarly there is a 159 XY wing pivoted at r9c9 (using the 19 and 15 in Box 3) which can be used to eliminate the 5 from r9c8

Apologies if the technical wording is wrong, I'm only an occasional...
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Marty R.



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

PostPosted: Mon Jan 23, 2012 12:49 am    Post subject: Reply with quote

TerenceF wrote:
Similarly there is a 159 XY wing pivoted at r9c9 (using the 19 and 15 in Box 3) which can be used to eliminate the 5 from r9c8

Apologies if the technical wording is wrong, I'm only an occasional...

Terence, the pivot is the 19 cell in r2c9 since that is the cell that sees the other two cells.
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