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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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 Posted: Wed Jan 18, 2012 7:39 am Post subject: Jan 18 VH |
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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: 34
Location: Boston, MA
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| Posted: Wed Jan 18, 2012 3:38 pm Post subject: |
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| I had a skyscraper on 9 in boxes 2 and 3. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jan 18, 2012 5:43 pm Post subject: |
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| 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 |
+-------------+---------+-----------+
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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
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| Posted: Wed Jan 18, 2012 8:27 pm Post subject: |
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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
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| Posted: Wed Jan 18, 2012 10:07 pm Post subject: |
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| 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 |
+-------------+---------+-----------+
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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"  ) 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: 34
Location: Boston, MA
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| Posted: Fri Jan 20, 2012 3:17 pm Post subject: |
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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: 26
Location: Takapuna, NZ
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| Posted: Mon Jan 23, 2012 12:14 am Post subject: |
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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: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jan 23, 2012 12:49 am Post subject: |
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| 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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