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Sep 24 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Thu Sep 23, 2010 10:56 pm    Post subject: Sep 24 VH Reply with quote

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

PostPosted: Fri Sep 24, 2010 4:45 am    Post subject: Sep 24 VH Reply with quote

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

PostPosted: Fri Sep 24, 2010 5:07 am    Post subject: Reply with quote

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

PostPosted: Fri Sep 24, 2010 8:54 pm    Post subject: Reply with quote

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

PostPosted: Fri Sep 24, 2010 9:57 pm    Post subject: Reply with quote

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

PostPosted: Fri Sep 24, 2010 10:07 pm    Post subject: Reply with quote

[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

PostPosted: Tue Sep 28, 2010 7:50 am    Post subject: Reply with quote

[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

PostPosted: Tue Sep 28, 2010 10:50 am    Post subject: Reply with quote

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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