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Jan 09 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Mon Jan 08, 2018 11:22 pm    Post subject: Jan 09 VH Reply with quote

Hi everyone,

Code:

+--------------+------------+-------------+
| 7    6    89 | 2  5    1  | 4    89  3  |
| 5    4    3  | 9  8    7  | 6    2   1  |
| 1    2    89 | 6  3    4  | 589  589 7  |
+--------------+------------+-------------+
| 48   5    2  | 7  146  68 | 3    16  9  |
| 489  1789 17 | 18 1246 3  | 15   156 28 |
| 3    18   6  | 5  12   9  | 7    4   28 |
+--------------+------------+-------------+
| 28   178  17 | 4  9    5  | 128  3   6  |
| 689  3    5  | 18 16   2  | 89   7   4  |
| 2689 189  4  | 3  7    68 | 1289 189 5  |
+--------------+------------+-------------+

Play this puzzle online at the Daily Sudoku site

1st: W-Wing 1,8 in r5c4,r6c2 connected by number 8 in r4c16 and -1 in r5c23,r6c5

Code:

+------------+-----------+------------+
| 7    6  89 | 2  5   1  | 4    89  3 |
| 5    4  3  | 9  8   7  | 6    2   1 |
| 1    2  89 | 6  3   4  | 589  589 7 |
+------------+-----------+------------+
| 48   5  2  | 7  146 68 | 3    16  9 |
| 489  89 7  | 18 146 3  | 15   156 2 |
| 3    1  6  | 5  2   9  | 7    4   8 |
+------------+-----------+------------+
| 28   7  1  | 4  9   5  | 28   3   6 |
| 689  3  5  | 18 16  2  | 89   7   4 |
| 2689 89 4  | 3  7   68 | 1289 189 5 |
+------------+-----------+------------+

Play this puzzle online at the Daily Sudoku site

2nd: XY-Wing 1,6,8 in r4c68,r5c4 and -1 in r4c5,r5c78

Ciao Gianni
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Tue Jan 09, 2018 7:52 am    Post subject: Reply with quote

I played the XY-Wing 1,2,8 pivoted at r6c5 and -8 in r5c9(=2) as my first step. Rinsed. Then played a UR89w/5 rows 1 and 3; columns 3 and 8 and r3c8=5 to avoid the DP. These steps could have been reversed with equal success.

cheers...immp
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hughwill



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

PostPosted: Tue Jan 09, 2018 9:12 am    Post subject: Reply with quote

After basics:
Code:

+--------------+------------+-------------+
| 7    6    89 | 2  5    1  | 4    89  3  |
| 5    4    3  | 9  8    7  | 6    2   1  |
| 1    2    89 | 6  3    4  | 589  589 7  |
+--------------+------------+-------------+
| 48   5    2  | 7  146  68 | 3    16  9  |
| 489  1789 17 | 18 1246 3  | 15   156 28 |
| 3    18   6  | 5  12   9  | 7    4   28 |
+--------------+------------+-------------+
| 28   178  17 | 4  9    5  | 128  3   6  |
| 689  3    5  | 18 16   2  | 189  7   4  |
| 2689 189  4  | 3  7    68 | 1289 189 5  |
+--------------+------------+-------------+

Play this puzzle online at the Daily Sudoku site

Interesting. 2 fairly obvious XY-wings (12-8 pivot r6c5 and 18-6 pivot r4c6).
Both are needed to leave basics only, but they can be done in either order.
One of them (12-8 ) linked with the obvious 89 UR leaves basics, but the 18-6
and the UR are insufficient. Maybe interesting to us geeks only, but I've not
seen one like this before......
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Tue Jan 09, 2018 9:19 am    Post subject: Reply with quote

Two XY-wings:

-168
1-28

Keith
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Tue Jan 09, 2018 10:02 am    Post subject: Reply with quote

With a quick look to identify some strong links, one could have also found the skyscraper on 8 (after the initial XY- Wing of 12-8).
It occurs in columns 2 and 6 (with a buddy shared in row 9); pincers then at r4c6 and r5c2. This makes r4c1-8 =4! and r5c4-8 =1!

I couldn't resist Keith, the bulb burns forever bright; I look for them all the time now. Thanks again...

immp
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