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Nov 20 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden

PostPosted: Fri Nov 20, 2015 9:32 am    Post subject: Nov 20 VH Reply with quote

I needed no advanced technique at all! Am I right?
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hughwill



Joined: 05 Apr 2010
Posts: 413
Location: Birmingham UK

PostPosted: Fri Nov 20, 2015 10:29 am    Post subject: Re: Nov 20 VH Reply with quote

roaa wrote:
I needed no advanced technique at all! Am I right?

I got to here with basics:
Code:

+-------------+------------------+--------------+
| 2    18 4   | 368   136  138   | 7  5   9     |
| 35   7  6   | 358   9    3458  | 1  2   348   |
| 359  18 59  | 2     1345 7     | 6  348 348   |
+-------------+------------------+--------------+
| 589  6  59  | 4     1357 13589 | 2  138 13578 |
| 458  3  7   | 58    2    158   | 9  6   1458  |
| 4589 2  1   | 35789 357  6     | 58 348 34578 |
+-------------+------------------+--------------+
| 67   4  238 | 1     67   23    | 58 9   258   |
| 16   5  23  | 369   8    239   | 4  7   12    |
| 17   9  28  | 57    457  245   | 3  18  6     |
+-------------+------------------+--------------+

Play this puzzle online at the Daily Sudoku site

and then needed the 18-2 XY-Wing to polish it off. I can't see any more
basics, but I may be wrong....

Hugh
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yeoks



Joined: 16 May 2010
Posts: 33

PostPosted: Fri Nov 20, 2015 12:01 pm    Post subject: Reply with quote

Hugh,
Take a look at Row 1 again.
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hughwill



Joined: 05 Apr 2010
Posts: 413
Location: Birmingham UK

PostPosted: Fri Nov 20, 2015 4:03 pm    Post subject: Reply with quote

yeoks wrote:
Hugh,
Take a look at Row 1 again.


Entirely correct. The absence of all those 3s makes it a basics only. I wonder
if this happens when there's a box-line interaction and a VH solution (the XY-wing) at
the same time and the software gives the VH solution precendence. I've
noticed that there are few if any wings in non VH puzzles.....

Hugh
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