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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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 Posted: Thu Sep 23, 2010 10:56 pm Post subject: Sep 24 VH |
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| XY-Wing 68 56 58 with pivot in r9c9 removing 8 in r3c6 solves the puzzle. |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Fri Sep 24, 2010 4:45 am Post subject: Sep 24 VH |
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| For those who enjoy a little longer ride, there is a second 568 xy-wing with pivot at r9c5. I found this one first before the one mentioned by Clement. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Sep 24, 2010 5:07 am Post subject: |
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| A W-Wing on 58 does it too. R9c9<>5. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Sep 24, 2010 8:54 pm Post subject: |
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How about the 6-cell ADP(235)r249c13, marked *, which is also called a BUG-Lite+1.
| Code: | *-----------------------------------------------------------*
| 4 1 7 | 25 68 3 | 2569 256 5689 |
|*25 8 *25 | 9 67 1 | 67 3 4 |
| 9 3 6 | 25 4 78 | 257 1 58 |
|-------------------+-------------------+-------------------|
|*35 6 *359 | 7 2 4 | 39 8 1 |
| 8 4 1 | 6 3 9 | 25 25 7 |
| 7 2 39 | 8 1 5 | 369 4 69 |
|-------------------+-------------------+-------------------|
| 1 9 4 | 3 57 67 | 8 56 2 |
| 6 5 8 | 1 9 2 | 4 7 3 |
|*23 7 *23 | 4 58 68 | 1 9 56 |
*-----------------------------------------------------------* |
This is similar to a Type 1 UR in that the pattern has a single cell that contains free, extra digits. Thus, r4c3<>35=9.
As infrequent and interesting as it may be, the ADP is not a one step solution here. In fact, any of the previously mentioned steps are still available and are required to complete the puzzle.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Sep 24, 2010 9:57 pm Post subject: |
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| Quote: | | How about the 6-cell ADP(235)r249c13, marked *, which is also called a BUG-Lite+1. |
That jumped off the page at me, but I didn't mention it because it didn't make a huge number of eliminations.
One of these days I might learn the difference between a DP and BUG-Lite. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Sep 24, 2010 10:07 pm Post subject: |
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[quote="Marty R."] | Quote: | | One of these days I might learn the difference between a DP and BUG-Lite. |
Marty, when you do, please inform tell me of the definition. I have been corrected numerous times but still keep trying. I have searched different sources but was unable to find a formal definition anywhere.
Ted |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Sep 28, 2010 7:50 am Post subject: |
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[quote="tlanglet"] | Marty R. wrote: | | Quote: | | One of these days I might learn the difference between a DP and BUG-Lite. |
Marty, when you do, please inform tell me of the definition. I have been corrected numerous times but still keep trying. I have searched different sources but was unable to find a formal definition anywhere.
Ted |
if r249c13 have exactly
r2c13 - 25
r4c13 - 35
r9c13 - 23
then the puzzle will not have a unique solution.
in a BUG situation, every remaining unsolved cell has exactly two candidates. hence its name - Bi value Universal Grave
your example is just a smaller version of the same situation and thus called a BUG-lite.
its unfortunate that the names are confusing us because the examples are so nice to find and often a treat to unleash.
the easiest thing to remember here is that deadly patterns encompass all of these patterns such as URs, MUGs, BUGs, BUGlites, reverse buglites, reverse BUGs. 6 cell patterns, 8 cells patterns, 10 cells patterns, etc...
the names are there to help categorize the specific patterns, nothing more. if anything, trying to figure out a category for these patterns is a problem unto itself.
think about this for a second. isn't a UR based on two candidates??
wouldn't this categorization then fit certain kinds of BUGlite scenarios??
hmm??? |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Tue Sep 28, 2010 10:50 am Post subject: |
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| storm_norm wrote: | think about this for a second. isn't a UR based on two candidates??
wouldn't this categorization then fit certain kinds of BUGlite scenarios? |
Yes, the smallest possible BUG-Lite is a UR ... and the largest possible in any given pencilmarked grid is a BUG. |
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