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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Jan 31, 2009 3:10 am Post subject: Jan 31 VH |
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An xy-wing (234) will solve it.
There are interesting alternatives, such as a UR (86), but the xy-wing is stiil need.
Earl |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jan 31, 2009 4:49 am Post subject: |
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| I saw the Type 1 UR but didn't use it, then found the same XY that you did. |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Sun Feb 01, 2009 11:46 pm Post subject: |
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| Yep. Way too easy. |
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woodbux
Joined: 03 Feb 2009
Posts: 2
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| Posted: Tue Feb 03, 2009 5:46 am Post subject: can't see it |
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| Code: |
+-----------+-----------+-----------+
| 4 9 2 | 37 8 1 | 37 6 5 |
| 3 5 8 | 6 24 27 | 47 9 1 |
| 1 7 6 | 9 5 34 | 2 48 38 |
+-----------+-----------+-----------+
| 9 238 5 | 234 1 6 | 34 7 238 |
| 7 23 4 | 8 23 9 | 1 5 6 |
| 68 2368 1 | 5 7 34 | 9 48 238 |
+-----------+-----------+-----------+
| 68 68 3 | 27 9 27 | 5 1 4 |
| 5 1 9 | 34 34 8 | 6 2 7 |
| 2 4 7 | 1 6 5 | 8 3 9 |
+-----------+-----------+-----------+
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I got this far and can't see the next step. I must be missing something obvious. I used one xyz-wing(234) to eliminate the 4 in r2c6.
Newbie would appreciate a not-so-terse hint.
Also, please, where's a good place to find definitions of all the terms you folks use. I've looked elsewhere on this site, but never seem to find the idiot's guide to terminology.
Thanks |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Feb 03, 2009 6:10 am Post subject: |
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Hi Woodbux, welcome to the forum. There is an XY-Wing on 23-24-34 pivoted in r5c5.
The Sudopedia site has a lot of information.
http://www.sudopedia.org/wiki/Main_Page
If that is not clear, you can Google sudoku techniques and you'll find lots of information out there.
Of course, always feel free to ask any questions you might have right here. There are lots of people who will be happy to help. |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Tue Feb 03, 2009 6:13 am Post subject: |
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Hi!
Here is a good place to look up terms.
http://www.sudopedia.org/wiki/Terminology
As for this puzzle:
| Code: | Here is an x-wing on 4s that eliminates the 4 in r2c6.
There is no xyz that does that in this puzzle.
.------------------.------------------.------------------.
| 4 9 2 | 37 8 1 | 37 6 5 |
| 3 5 8 | 6 24 27-4 | 47 9 1 |
| 1 7 6 | 9 5 *34 | 2 *48 38 |
:------------------+------------------+------------------:
| 9 238 5 | 234 1 6 | 34 7 238 |
| 7 23 4 | 8 23 9 | 1 5 6 |
| 68 2368 1 | 5 7 *234 | 9 *48 238 |
:------------------+------------------+------------------:
| 68 68 3 | 27 9 27 | 5 1 4 |
| 5 1 9 | 34 34 8 | 6 2 7 |
| 2 4 7 | 1 6 5 | 8 3 9 |
'------------------'------------------'------------------'
As for what you are missing it is an xy-wing on 234.
.------------------.------------------.------------------.
| 4 9 2 | 37 8 1 | 37 6 5 |
| 3 5 8 | 6 *24 247 | 47 9 1 |
| 1 7 6 | 9 5 *34 | 2 48 38 |
:------------------+------------------+------------------:
| 9 238 5 | 234 1 6 | 34 7 238 |
| 7 23 4 | 8 *23 9 | 1 5 6 |
| 68 2368 1 | 5 7 24-3 | 9 48 238 |
:------------------+------------------+------------------:
| 68 68 3 | 27 9 27 | 5 1 4 |
| 5 1 9 | 34 34 8 | 6 2 7 |
| 2 4 7 | 1 6 5 | 8 3 9 |
'------------------'------------------'------------------' |
That is the only hard step required in this puzzle.  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Feb 03, 2009 6:14 am Post subject: |
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In the position you posted, there is an XY-wing that takes out <3> in R6C6.
Keith |
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woodbux
Joined: 03 Feb 2009
Posts: 2
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| Posted: Wed Feb 04, 2009 3:28 am Post subject: many thanks |
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Thank you for the sudopedia links. Perfect!
And thanks for the hints.... especially the handholding, wapati. That ended my frustration. |
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