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Aug 26 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden
PostPosted: Wed Aug 26, 2015 7:13 am    Post subject: Aug 26 VH Reply with quote
XY-wing 169, pivot r9c3, forces r9c2<>9, which solves it.
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bat999



Joined: 09 Jul 2015
Posts: 55
Location: UK
PostPosted: Wed Aug 26, 2015 8:28 am    Post subject: Reply with quote
Code:
.------------------.-----------.----------------.
|  67    67    2   | 9   3   8 |  4     1    5  |
|  3     1     8   | 4   2   5 |  69    7    69 |
|  9     4     5   | 6   7   1 |  2     3    8  |
:------------------+-----------+----------------:
|  1567  567   167 | 12  8   4 |  3     269  69 |
|  2     3     4   | 7   6   9 |  8     5    1  |
|  16    8     9   | 12  5   3 |  7     26   4  |
:------------------+-----------+----------------:
|  8     9-6   3   | 5   4   2 |  1    c69   7  |
| a157   2    a17  | 8   19  6 | b59    4    3  |
|  4     569  a16  | 3   19  7 |  59-6  8    2  |
'------------------'-----------'----------------'
(6=5)r8c13,r9c3 - (5=9)r8c7 - (9=6)r7c8 => -6 r7c2,r9c7; stte
Cool
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Jeff



Joined: 06 May 2007
Posts: 46
PostPosted: Fri Sep 11, 2015 1:02 am    Post subject: Reply with quote
I have always been able to solve these very hard puzzles using the rather "standard" simple techniques, but not this one. I have the same numbers as are shown in the grid, however, I do not understand the nomenclature used in the solution. Is there a simpler less complex way to solve it. Maybe I will have to master the nomenclature. Many thanks. Sad
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Jeff



Joined: 06 May 2007
Posts: 46
PostPosted: Fri Sep 11, 2015 1:24 am    Post subject: Reply with quote
Many thanks. Smile
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Sep 11, 2015 4:16 am    Post subject: Reply with quote
Jeff wrote:
I have always been able to solve these very hard puzzles using the rather "standard" simple techniques, but not this one. I have the same numbers as are shown in the grid, however, I do not understand the nomenclature used in the solution. Is there a simpler less complex way to solve it. Maybe I will have to master the nomenclature. Many thanks. Sad


Jeff, I assume you're referring to the XY-Wing that ROAA used. This is a move you really want to learn, as many of these puzzles require that move for solving. Here is an explanation. If it's not clear, don't hesitate to ask further.

http://www.learn-sudoku.com/xy-wing.html
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