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Feb 26 VH

 
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Clement



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

PostPosted: Thu Feb 25, 2010 10:07 pm    Post subject: Feb 26 VH Reply with quote

An XYZ-Wing 126 with Pincers 16 in r2c1 and 26 in r5c3 eliminating 6 in r4c1 solves the puzzle.
There is also a UR 89 in row 8 which equally solves it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Feb 26, 2010 4:45 am    Post subject: Reply with quote

Another XYZ-Wing in the same boxes will do it too, on 136, accomplishing the same thing slightly differently. Also a W-Wing on 16 in boxes 16 does it as well.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Fri Feb 26, 2010 1:39 pm    Post subject: Reply with quote

It's a good one for the crayons: colouring on <1>.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Fri Feb 26, 2010 3:38 pm    Post subject: Re: Feb 26 VH Reply with quote

Clement wrote:
There is also a UR 89 in row 8 which equally solves it.


Clement, I also used the Type 1 UR89, but it was not a one-step solution.

Ted
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Clement



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

PostPosted: Fri Feb 26, 2010 6:18 pm    Post subject: Feb 26 VH Reply with quote

Tlanglet,
Your are quite right the UR does not solve in one step, I didn't check it properly. It has to be followed by an X-Wing in 1 and XY- Wing 23 36 26.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Feb 27, 2010 2:45 pm    Post subject: Reply with quote

Code:

+-------+-------+-------+
| . . . | 7 . . | 6 . . |
| . 4 . | . . 2 | . 9 . |
| 7 2 . | . 9 . | . 3 . |
+-------+-------+-------+
| . . . | . 2 . | 5 . 9 |
| . 8 . | 9 . 4 | . 7 . |
| 5 . 7 | . 6 . | . . . |
+-------+-------+-------+
| . 5 . | . 7 . | . 4 8 |
| . 6 . | 4 . . | . 2 . |
| . . 1 | . . 3 | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

After basics:
Code:
+----------------+----------------+----------------+
| 89   13   3589 | 7    4    18   | 6    15   2    |
| 16%  4    56   | 15%  3    2    | 8    9    7    |
| 7    2    58   | 158# 9    6    | 4    3    15#  |
+----------------+----------------+----------------+
|-136  13   4    |-18   2    7    | 5    168  9    |
| 126@ 8    26   | 9    5    4    | 3    7    16@  |
| 5    9    7    | 3    6    18   | 2    18   4    |
+----------------+----------------+----------------+
| 23   5    23   | 6    7    9    | 1    4    8    |
| 89   6    89   | 4    1    5    | 7    2    3    |
| 4    7    1    | 2    8    3    | 9    56   56   |
+----------------+----------------+----------------+

I must be on the slow side. Over the years I have convinced myself (and, perhaps, Marty) that swordfish are not worth bothering to find. Now I realize that my compound skyscrapers are (franken) swordfish (I think).

I see this as a skyscraper grounded in C9. The two towers are @ and the compound tower #%. Taking out 1 in R4C1.

There are various ways to find the elimination in R4C4, including the compound skyscraper with towers # and @%, or by noting that the pincers are both in the same house, C1, so we have a cycle.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Feb 27, 2010 4:28 pm    Post subject: Reply with quote

I do see an ordinary swordfish there. I don't know what a franken anything is. I'm also having a problem with terminology (towers, compound skyscrapers). I see skyscrapers and rows 35 and a strong link in row 2.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Feb 27, 2010 8:51 pm    Post subject: Reply with quote

Danny (or someone),

What is this called?
Code:
 +-----------------------------------+
 |  .  X  .  |  .  /  .  |  /  *  *  |
 |  *  /  *  |  .  /  .  |  X  .  .  |
 |  .  /  .  |  .  /  .  |  /  .  .  |
 |-----------+-----------+-----------|
 |  .  /  .  |  .  X  .  |  X  .  .  |
 |  .  /  .  |  .  /  .  |  /  .  .  |
 |  .  /  .  |  .  /  .  |  /  .  .  |
 |-----------+-----------+-----------|
 |  .  /  .  |  .  /  .  |  /  .  .  |
 |  .  /  .  |  .  /  .  |  /  .  .  |
 |  .  X  .  |  .  X  .  |  /  .  .  |
 +-----------------------------------+
X  contains the candidate
/ does not contain the candidate
*  cells where eliminations are possible

Yes, it is multicoloring. I call it a compound skyscraper since I generally find this type of pattern when looking for kites and skyscrapers.

Would anyone classify it as a fish? Note that if we move the candidate from R1C2 to R2C2 it becomes a swordfish.

Keith
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sun Feb 28, 2010 6:06 am    Post subject: Reply with quote

keith wrote:
Danny (or someone),

What is this called? Would anyone classify it as a fish? Note that if we move the candidate from R1C2 to R2C2 it becomes a swordfish.

A Skyscraper is 2x Sashimi X-Wings performed simultaneously. What you have is 2x Sashimi Swordfish that you are performing simultaneously.

Code:
Sashimi Swordfish #1: c257\r149 w/fin cell r2c7  =>  r1c89<>X
Sashimi Swordfish #2: c257\r249 w/fin cell r1c2  =>  r2c13<>X

Notice that the Sashimi Swordfish only differ by the selection of [r1] vs [r2] in the cover set. I called this a Siamese Sashimi Swordfish, but it never caught on. Ironically, the topic of Siamese fish was resurrected in the Players' Forums within the past few days. However, their intent was to expand the definition.

Regards, Danny
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