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Jan 16 VH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Mon Jan 16, 2012 5:56 am    Post subject: Jan 16 VH Reply with quote

Where's Clement when you need him? Very Happy

I found this to be quite different from the usual VH. I saw no freebies at the start and populating the grid was more complicated than usual, as were the basics. But after that there was a typical solution.

Quote:
XY-Wing (563), pivot r2c1; r789c2<>3
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roaa



Joined: 18 Apr 2009
Posts: 78
Location: Sweden

PostPosted: Mon Jan 16, 2012 10:34 am    Post subject: Reply with quote

I fully agree with Marty R! Also with the final xy-wing (356)?
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Mon Jan 16, 2012 1:04 pm    Post subject: Reply with quote

For a non typical solution I like
Code:
 *--------------------------------------------------------------------*
 | 7     *36     8      | 49     149    5      | 2     *36     149    |
 | 56     4      2      | 389    13689  7      | 59     68     19     |
 | 9      1      35     | 2      468    68     | 35     678    47     |
 |----------------------+----------------------+----------------------|
 | 2      5      6      | 89     89     4      | 7      1      3      |
 | 13     8      7      | 5      36     136    | 4      9      2      |
 | 4      9      13     | 7      23     123    | 6      5      8      |
 |----------------------+----------------------+----------------------|
 | 1368  f367    139    | 348    3478   38     | 39     2      5      |
 | 358   f237    359    | 6      23578  238    | 1      4      79     |
 | 5-3   *237    4      | 1      2357   9      | 8     *37     6      |
 *--------------------------------------------------------------------*
double finned x-wing
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Mon Jan 16, 2012 5:58 pm    Post subject: Re: Jan 16 VH Reply with quote

Marty R. wrote:
Where's Clement when you need him? Very Happy

I found this to be quite different from the usual VH. I saw no freebies at the start and populating the grid was more complicated than usual, as were the basics. But after that there was a typical solution.

Quote:
XY-Wing (563), pivot r2c1; r789c2<>3
For almost 24 hrs, no solution on site Sad
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LloydB



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

PostPosted: Tue Jan 17, 2012 12:54 am    Post subject: Reply with quote

I certainly agree that this was one of the most difficult ones just to get through the basics!

From the position posted by Arkietech the 356 XY-wing centered in r2c1 leads to the solution.
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Jeff



Joined: 06 May 2007
Posts: 32

PostPosted: Thu Jan 19, 2012 3:35 am    Post subject: Reply with quote

This is a tough puzzle. I am stumped. I have the grid pretty much like the diagram provided by arkietech, except I have a 3 in the following squares: C1R2 (making it 356), C7R2 (making it 359), AND C8R2 (making it 368). After working on this for quite awhile, I cannot figure out how to make those 3's disappear. I would appreciate some help. Many thanks.
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Thu Jan 19, 2012 4:54 am    Post subject: Reply with quote

All of your extra 3's are eliminated because the 3 in box 2 must be in row 2, thus precluding a 3 elsewhere in that row.

This technique for eliminating candidates is known as Locked Candidates or Box-Line Interactions.
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Jeff



Joined: 06 May 2007
Posts: 32

PostPosted: Thu Jan 19, 2012 5:49 am    Post subject: Reply with quote

Marty,

Thanks. I don't know how I missed that!

Jeff
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keith



Joined: 19 Sep 2005
Posts: 3178
Location: near Detroit, Michigan, USA

PostPosted: Tue Jan 24, 2012 12:46 pm    Post subject: Reply with quote

After solving only a few squares, naked singles, there is a W-wing 35 - 13 - 13 - 35 in chute 1 that solves it.

Keith
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