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Sep 13 VH

 
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Wed Sep 12, 2012 6:06 pm    Post subject: Sep 13 VH Reply with quote

I don't want to spoil the fun with TOO early a post, but just hint:

I had to work through two Hard steps before finding an xyz wing, and still that wasn't enough! An xy wing was then needed.

Perhaps somebody will find an easier path.
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Mindwarp



Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England

PostPosted: Thu Sep 13, 2012 1:08 am    Post subject: Sep 13 VH Reply with quote

I didn't find it that hard, though I maybe applying techniques without knowing their names. Identifying the number in R2C5 was the key to solving it for me. It took me 9 minutes and 8 seconds, which is around normal time for me on a VH using sweep.
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Marty R.



Joined: 12 Feb 2006
Posts: 5176
Location: Rochester, NY, USA

PostPosted: Thu Sep 13, 2012 1:26 am    Post subject: Reply with quote

I needed two steps. But the XYZ-Wing was there after basics and that opened up the puzzle-ending XY-Wing. These are usually one-steppers for me.
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hughwill



Joined: 05 Apr 2010
Posts: 222
Location: Birmingham UK

PostPosted: Thu Sep 13, 2012 9:28 am    Post subject: Post subject: Sep 13 VH Reply with quote

Code:

+--------------+-------------+---------+
| 3  1247 247  | 15 145  9   | 27 6 8  |
| 8  5    46   | 2  46   7   | 9  3 1  |
| 67 1267 9    | 3  16   8   | 27 5 4  |
+--------------+-------------+---------+
| 67 9    5    | 17 3    16  | 4  8 2  |
| 2  3    1    | 89 89   4   | 5  7 6  |
| 4  67   8    | 57 2    56  | 3  1 9  |
+--------------+-------------+---------+
| 5  8    2367 | 4  17   123 | 16 9 37 |
| 1  267  2367 | 89 5789 235 | 68 4 37 |
| 9  47   347  | 6  178  13  | 18 2 5  |
+--------------+-------------+---------+

Play this puzzle online at the Daily Sudoku site

The XYZ wing pivoted on r9c5 sets r9c6 to 3- and so does the XY
wing pivoted on r7c5. I couldn't find a single step, but it was not too difficult.
I didn't see the essential role of r2c5 mentioned by Mindwarp-
any further info?
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