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RobertRattley
Joined: 24 Jun 2007
Posts: 118
Location: Australia
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 Posted: Wed Sep 12, 2012 6:06 pm Post subject: Sep 13 VH |
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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
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| Posted: Thu Sep 13, 2012 1:08 am Post subject: Sep 13 VH |
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| 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: 5770
Location: Rochester, NY, USA
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| Posted: Thu Sep 13, 2012 1:26 am Post subject: |
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| 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: 424
Location: Birmingham UK
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| Posted: Thu Sep 13, 2012 9:28 am Post subject: Post subject: Sep 13 VH |
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| 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 |
+--------------+-------------+---------+
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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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