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JUL 12 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 72
Location: Sweden

PostPosted: Sat Jul 12, 2014 7:53 am    Post subject: JUL 12 VH Reply with quote

The XY-wing 269 gives r5c789<>6.
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hughwill



Joined: 05 Apr 2010
Posts: 198
Location: Birmingham UK

PostPosted: Sat Jul 12, 2014 11:21 am    Post subject: Jul 12 VH Reply with quote

After basics:

Code:

+---------+-----------+------------+
| 2 6  7  | 8   49 49 | 5  1   3   |
| 3 4  5  | 1   26 26 | 9  8   7   |
| 9 8  1  | 5   3  7  | 2  46  46  |
+---------+-----------+------------+
| 8 39 36 | 4   5  69 | 1  7   2   |
| 5 1  26 | 269 7  8  | 36 346 469 |
| 7 29 4  | 269 1  3  | 8  5   69  |
+---------+-----------+------------+
| 6 23 23 | 7   8  5  | 4  9   1   |
| 1 5  9  | 36  24 24 | 7  36  8   |
| 4 7  8  | 369 69 1  | 36 2   5   |
+---------+-----------+------------+

Play this puzzle online at the Daily Sudoku site

I tried this one last night and it just fell to pieces with basics like an 'Easy".
The trouble is that you can never work out where you put in the right
number without a logical justification- the inadvertent 'lucky guess'....
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Sat Jul 12, 2014 3:09 pm    Post subject: Reply with quote

Quote:
The trouble is that you can never work out where you put in the right
number without a logical justification- the inadvertent 'lucky guess'....


I don't understand. ???
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Lee



Joined: 10 Jun 2014
Posts: 6
Location: San Francisco

PostPosted: Sat Jul 12, 2014 4:05 pm    Post subject: Reply with quote

W-wing using 69's with a strong link on 9's in row 5 yields r6c4 <>6 which also solves. This seemed to be one of the easier "very hard" puzzles.
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hughwill



Joined: 05 Apr 2010
Posts: 198
Location: Birmingham UK

PostPosted: Sat Jul 12, 2014 5:06 pm    Post subject: Reply with quote

Marty said:

Quote:
I don't understand. ???



I was referring to the times when VHs come out without needing any
VH techniques. Almost always, it's because I've put in a number
thinking that there's a logical reason, but in reality without any
justification because my reasoning was unsound. It's like any other
mistake, but involves putting in the right number by chance, and leads
to the solving of the puzzle.

The trouble is, you can't look back to find out where you went
wrong putting in the right number!

Sorry Marty if this explanation is as obscure as the original- I feel a bit like
Donald Rumsfeld talking about unknown unknowns (which incidentally
was probably the only thing he ever said that I agreed with!).

Hugh
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Sat Jul 12, 2014 7:49 pm    Post subject: Reply with quote

I understand. Many times I've finished a puzzle (not just those here) without using any advanced techniques. That always makes me suspicious and I start all over again.
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Keith X



Joined: 13 Jul 2014
Posts: 3
Location: Texas

PostPosted: Sun Jul 13, 2014 12:12 am    Post subject: Reply with quote

Why doesn’t the XYZ-wing at R6C4 (wings at R4C6 & R6C2) lead to <>9 in R4C2? It seems to meet the stipulations?!
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Sun Jul 13, 2014 12:17 am    Post subject: Reply with quote

Keith X wrote:
Why doesn’t the XYZ-wing at R6C4 (wings at R4C6 & R6C2) lead to <>9 in R4C2? It seems to meet the stipulations?!


Welcome Keith. For an elimination to be made from an XYZ-Wing, the cell from which the elimination can be made must see all three of XYZ, XZ and YZ. R4c2 doesn't see the XYZ (r6c4).
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Keith X



Joined: 13 Jul 2014
Posts: 3
Location: Texas

PostPosted: Sun Jul 13, 2014 1:21 am    Post subject: Reply with quote

Kapeesh, thanks!
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