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Jan 2 VH

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Fri Jan 02, 2009 3:17 am    Post subject: Jan 2 VH Reply with quote

A skyscraper (of the past year numerically) is a single-step solution.

Earl

PS The skyscraper (8) in C69 eliminates the 8 in R6C4.


Last edited by Earl on Fri Jan 02, 2009 10:18 pm; edited 1 time in total
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Marty R.



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

PostPosted: Fri Jan 02, 2009 4:42 am    Post subject: Reply with quote

I used an X-Wing sandwiched between a pair of W-Wings.
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cgordon



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

PostPosted: Fri Jan 02, 2009 3:16 pm    Post subject: Reply with quote

I couldn't find the single step solution. I couldn't even find the w-wings. Had to use an x-wing on <8> then a <138> xy-wing then colouring on <8>. Good one though!
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LloydB



Joined: 09 Jul 2007
Posts: 21
Location: Skagit Co., WA USA

PostPosted: Fri Jan 02, 2009 5:13 pm    Post subject: Reply with quote

The 138 XY wing was all I required.
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cgordon



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

PostPosted: Fri Jan 02, 2009 6:00 pm    Post subject: Reply with quote

I'm not following the above posts I don't see how the <138> xy-wing appears before the x-wing on <8> is made (or the skyscraper). And I don't see how the skyscraper can be used as a single step. Maybe I missed a basic move - can't see it though.
These are my remaining 8's.
Code:
            
+-------+-------+-------+   
| . . . | 8 8 8 | . . 8 |   
| . . . | . 8 . | 8 . . |   
| . . . | . . . | . . . |   
+-------+-------+-------+   
| . . . | . . . | . . . |   
| . . . | 8 . 8 | . 8 . |   
| . . . | 8 . . | 8 . 8 |   
+-------+-------+-------+   
| . . . | 8 . . | 8 8 . |   
| . . . | . 8 . | 8 . . |   
| . . . | . . . | . . . |
+-------+-------+-------+
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Clement



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

PostPosted: Fri Jan 02, 2009 6:38 pm    Post subject: Daily Sudoku: Fri 2-Jan-2009 VH Reply with quote

Two steps: XY-Wing 128 Pivot {1,2}r9c6 eliminating the 8's in BLOCK 5, then an X-Wing in 8's r28c57 eiliminating the 8's in BLOCK 6 & 9 c7 solving the puzzle.
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keith



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

PostPosted: Fri Jan 02, 2009 9:20 pm    Post subject: Reply with quote

After basics:
Code:
+-------------+-------------+-------------+
| 5   6   1   | 289 389 28  | 4   7   38  |
| 7   4   23  | 5   38  6   | 238 1   9   |
| 9   8   23  | 7   1   4   | 5   6   23  |
+-------------+-------------+-------------+
| 3   15  8   | 6   4   7   | 129 29  25  |
| 2   9   4   |13-8 5   18@ | 7   38  6   |
| 6   15  7   |3-8  2   9   | 138 4   358 |
+-------------+-------------+-------------+
| 4   7   9   | 28@ 6   5   | 238 38  1   |
| 1   2   6   | 4   89  3   | 89  5   7   |
| 8   3   5   | 129 7   12# | 6   29  4   |
+-------------+-------------+-------------+
The pincers @ of the <128> XY-wing make two eliminations, solving the puzzle.

Keith
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