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Jan11 VH

 
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Marty R.



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

PostPosted: Wed Jan 11, 2017 6:04 am    Post subject: Jan11 VH Reply with quote

Code:

+-------------+---------------+-----------+
| 2   4  789  | 3789 1378 5   | 17  6 13  |
| 6   1  57   | 37   4    2   | 9   8 35  |
| 578 3  5789 | 6    178  789 | 157 2 4   |
+-------------+---------------+-----------+
| 1   9  27   | 4    578  78  | 6   3 25  |
| 37  58 237  | 579  6    79  | 158 4 125 |
| 4   58 6    | 23   23   1   | 58  9 7   |
+-------------+---------------+-----------+
| 9   2  1    | 78   78   3   | 4   5 6   |
| 35  7  4    | 25   9    6   | 23  1 8   |
| 358 6  358  | 1    25   4   | 23  7 9   |
+-------------+---------------+-----------+

Play this puzzle online at the Daily Sudoku site
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Wed Jan 11, 2017 10:36 am    Post subject: Jan 11 VH Reply with quote

Using Marty's basics, a 275 XY-wing leads via more basics to:
Code:

+-----------+----------+---------+
| 2   4 89  | 39 38 5  | 7  6 1  |
| 6   1 5   | 7  4  2  | 9  8 3  |
| 78  3 789 | 6  1  89 | 5  2 4  |
+-----------+----------+---------+
| 1   9 27  | 4  58 78 | 6  3 25 |
| 357 8 237 | 59 6  79 | 1  4 25 |
| 4   5 6   | 23 23 1  | 8  9 7  |
+-----------+----------+---------+
| 9   2 1   | 8  7  3  | 4  5 6  |
| 35  7 4   | 25 9  6  | 23 1 8  |
| 358 6 38  | 1  25 4  | 23 7 9  |
+-----------+----------+---------+

Play this puzzle online at the Daily Sudoku site

Where an 89-7 XY wing leads to -7r5c1 stte. Interestingly(?), both XY-wings are
in the less common rectangle formation.....Of course I may have missed the
killer one-stepper...
Hugh
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Marty R.



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

PostPosted: Wed Jan 11, 2017 12:43 pm    Post subject: Reply with quote

The 27-5 was a one-stepper for me. However, I was doing it with pencil and paper, where my error rate is very high. I'll accept your solution.
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Wed Jan 11, 2017 3:22 pm    Post subject: Jan 11 VH Reply with quote

Unique Rectangle: 58, R5C7 = 1;
789 xy wing at R3C6, R5C1 = 3.

Early Earl
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