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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Fri Dec 07, 2007 6:45 am Post subject: Dec 7 vh |
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First choice after basics: xy-wing.
Either left side 41-16-64 or right side 97-76-69. Both lead to the same cells being solved. |
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TexCat
Joined: 07 Jul 2006
Posts: 32
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| Posted: Fri Dec 07, 2007 7:55 am Post subject: |
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| After basic moves, I was done. I didn't seem to need any kind of wing. |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Fri Dec 07, 2007 9:07 am Post subject: |
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There is also a useless [16-56-15] xy-wing@, when using the two pincer
cells (either R5C1=1, R8C9=1, or both), which pins <4> in R3C1
| Code: |
+--------------------------+--------------------------+-------------------------+
| 2 69 5 | 3 69 7 | 8 1 4 |
| 167 167 3 | 4 8 16 | 25 25 9 |
| 14 149 8 | 15 2 59 | 6 3 7 |
+--------------------------+--------------------------+-------------------------+
| 47 8 79 | 6 5 3 | 1 49 2 |
|@16 3 169 | 7 4 2 | 59 8 @56 |
| 5 46 2 | 9 1 8 | 34 7 36 |
+--------------------------+--------------------------+-------------------------+
| 9 5 4 | 8 7 16 | 23 26 13 |
| 8 2 67 | 15 3 4 | 79 69 @15 |
| 3 167 167 | 2 69 59 | 457 456 8 |
+--------------------------+--------------------------+-------------------------+
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andras
Joined: 31 Oct 2007
Posts: 56
Location: Mid Wales
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| Posted: Fri Dec 07, 2007 10:34 am Post subject: |
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Yes, I saw the 1-4-7 immediately, but remembered to wait until I could get a copy of the puzzle at that point before I moved on. 
Now I'll see if I can spot any ERs on it!
John |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Fri Dec 07, 2007 3:24 pm Post subject: |
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| Took me forever to find the <146> x wing - which is why I don't like em. Looked for ERs - never found none. But there's no straight-through basic solution Texcat - you must have erred. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 07, 2007 4:11 pm Post subject: |
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| Johan wrote: | There is also a useless [16-56-15] xy-wing@, when using the two pincer
cells (either R5C1=1, R8C9=1, or both), which pins <4> in R3C1
| Code: |
+--------------------------+--------------------------+-------------------------+
| 2 69 5 | 3 69 7 | 8 1 4 |
| 167 167 3 | 4 8 16 | 25 25 9 |
| 14 149 8 | 15 2 59 | 6 3 7 |
+--------------------------+--------------------------+-------------------------+
| 47 8 79 | 6 5 3 | 1 49 2 |
|@16 3 169 | 7 4 2 | 59 8 @56 |
| 5 46 2 | 9 1 8 | 34 7 36 |
+--------------------------+--------------------------+-------------------------+
| 9 5 4 | 8 7 16 | 23 26 13 |
| 8 2 67 | 15 3 4 | 79 69 @15 |
| 3 167 167 | 2 69 59 | 457 456 8 |
+--------------------------+--------------------------+-------------------------+
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Johan, did you leave out some words? The two pincers eliminate nothing. But color the pincer from r8c9-->r8c4-->r3c4 and the new pincer in r3c4 combines with the other original pincer in r5c1 to knock out the 1 from r3c1. |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Fri Dec 07, 2007 6:53 pm Post subject: Fri 7-Dec-2007 VH |
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| Could be solved by XY-Wing {1,6} as a pivot in r5c1 and {1,4}r3c1 {4,6}r6c2 as pincers removing the 4 in r3c2. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Dec 07, 2007 7:08 pm Post subject: |
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| just scanning and pencil marks made this puzzle quite fun. |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Sat Dec 08, 2007 10:53 am Post subject: |
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| Quote: | | Johan, did you leave out some words? The two pincers eliminate nothing. But color the pincer from r8c9-->r8c4-->r3c4 and the new pincer in r3c4 combines with the other original pincer in r5c1 to knock out the 1 from r3c1. |
Marty,
I thought with the two strong links on <1> in R8 and C4, it wasn't too
difficult to spot, extending the R8C9 pincer, but you're right I should have
mentioned that when
R8C9=1, then R8C4=5 and R3C4=1, eliminating <1> in R3C1, |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Dec 08, 2007 3:38 pm Post subject: |
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| Johan wrote: | | Quote: | | Johan, did you leave out some words? The two pincers eliminate nothing. But color the pincer from r8c9-->r8c4-->r3c4 and the new pincer in r3c4 combines with the other original pincer in r5c1 to knock out the 1 from r3c1. |
Marty,
I thought with the two strong links on <1> in R8 and C4, it wasn't too
difficult to spot, extending the R8C9 pincer, but you're right I should have
mentioned that when
R8C9=1, then R8C4=5 and R3C4=1, eliminating <1> in R3C1, |
Johan, you're correct, it's easy to spot if you know the technique. Personally, I just learned about coloring pincers a few months ago; I have to assume there are others reading this forum who might not yet have learned it.  |
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TexCat
Joined: 07 Jul 2006
Posts: 32
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| Posted: Sun Dec 09, 2007 7:37 pm Post subject: |
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| cgordon wrote: | | But there's no straight-through basic solution Texcat - you must have erred. |
When I finished the puzzle, I thought I must have done something wrong and then did it again. I must have made the same mistake the second time, because it was just as straightforward. I'll be darned if I can do it now a third time though.  |
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