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Sep 4 VH

 
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TerenceF



Joined: 21 Dec 2007
Posts: 26
Location: Takapuna, NZ

PostPosted: Sun Sep 04, 2016 4:24 am    Post subject: Sep 4 VH Reply with quote

It took me multiple steps, but here goes with my answer:

1-2-8 XY-wing pivoted on r9c1 eliminates 1 from r3c4:

Code:

+-------------------+---------------+-------------------+
| 7     1269  5     | 4   129  269  | 8     3    129    |
| 1236  4     1239  | 168 5    2689 | 129   7    129    |
| 12    129   8     | 17  1279 3    | 5     4    6      |
+-------------------+---------------+-------------------+
| 12368 12689 1239  | 5   238  7    | 1239  2689 4      |
| 1238  12789 12379 | 368 4    268  | 12379 2589 123589 |
| 5     2678  4     | 9   238  1    | 237   268  238    |
+-------------------+---------------+-------------------+
| 9     178   17    | 2   37   4    | 6     58   358    |
| 4     5     27    | 37  6    89   | 239   1    2389   |
| 28    3     6     | 18  189  5    | 4     289  7      |
+-------------------+---------------+-------------------+

Play this puzzle online at the Daily Sudoku site


3-6-8 XY wing pivoted on r5c1 eliminates 6 from r2c4, so r5c4=6
plus 2689 naked quad in Box 6 simplifies that box
then 2389 naked quad emerges in row 5

Code:


+--------------+--------------+------------------+
| 7   269  5   | 4   129 269  | 8     3    129   |
| 36  4    239 | 168 5   2689 | 129   7    129   |
| 1   29   8   | 7   29  3    | 5     4    6     |
+--------------+--------------+------------------+
| 368 1269 239 | 5   238 7    | 1239  2689 4     |
| 38  1279 239 | 68  4   268  | 12379 289  12589 |
| 5   267  4   | 9   238 1    | 237   268  28    |
+--------------+--------------+------------------+
| 9   8    1   | 2   7   4    | 6     5    3     |
| 4   5    7   | 3   6   89   | 29    1    289   |
| 2   3    6   | 18  189 5    | 4     89   7     |
+--------------+--------------+------------------+

Play this puzzle online at the Daily Sudoku site

From here,
9 in c8 must be in box 6 eliminating 9 from r9c8, stte
There is also an X wing on 3 in columns 5 and 7 which removes 3 in r4c1 and r4c3, but does'nt make everything drop out

Code:

+--------------+-------------+--------------+
| 7   269  5   | 4  129 269  | 8   3    129 |
| 36  4    239 | 18 5   2689 | 129 7    129 |
| 1   29   8   | 7  29  3    | 5   4    6   |
+--------------+-------------+--------------+
| 368 1269 239 | 5  238 7    | 13  2689 4   |
| 38  17   239 | 6  4   28   | 17  289  15  |
| 5   267  4   | 9  238 1    | 37  268  28  |
+--------------+-------------+--------------+
| 9   8    1   | 2  7   4    | 6   5    3   |
| 4   5    7   | 3  6   89   | 29  1    289 |
| 2   3    6   | 18 189 5    | 4   89   7   |
+--------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site
[/code]
Play this puzzle online at the Daily Sudoku site




Happy Father's Day from New Zealand!
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Sun Sep 04, 2016 10:31 am    Post subject: Sep 4 VH Reply with quote

Code:

+-------------------+---------------+-------------------+
| 7     1269  5     | 4   129  269  | 8     3    129    |
| 1236  4     1239  | 168 5    2689 | 129   7    129    |
| 12    129   8     | 17  1279 3    | 5     4    6      |
+-------------------+---------------+-------------------+
| 12368 12689 1239  | 5   238  7    | 1239  2689 4      |
| 1238  12789 12379 | 368 4    268  | 12379 2589 123589 |
| 5     2678  4     | 9   238  1    | 237   268  238    |
+-------------------+---------------+-------------------+
| 9     178   17    | 2   37   4    | 6     58   358    |
| 4     5     27    | 37  6    89   | 239   1    2389   |
| 28    3     6     | 18  189  5    | 4     289  7      |
+-------------------+---------------+-------------------+

Play this puzzle online at the Daily Sudoku site

Looks like basics only after the first (28-1) XY-wing though they do include
a quad. Remarkably few basics before needing the Wing though, I thought
I had missed something...

Hugh
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun Sep 04, 2016 11:35 am    Post subject: Reply with quote

Agree that the 28-1 XY-Wing is the only step needed.
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