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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Fri Jan 02, 2009 3:17 am Post subject: Jan 2 VH |
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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
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| Posted: Fri Jan 02, 2009 4:42 am Post subject: |
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| 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
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| Posted: Fri Jan 02, 2009 3:16 pm Post subject: |
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| 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
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| Posted: Fri Jan 02, 2009 5:13 pm Post subject: |
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| The 138 XY wing was all I required. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Fri Jan 02, 2009 6:00 pm Post subject: |
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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
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| Posted: Fri Jan 02, 2009 6:38 pm Post subject: Daily Sudoku: Fri 2-Jan-2009 VH |
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| 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
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| Posted: Fri Jan 02, 2009 9:20 pm Post subject: |
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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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