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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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 Posted: Sun Jan 06, 2013 9:12 am Post subject: Jan 6 VH |
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| I used 3 XY-wings. First (147) with pivot at r4c3 followed by 2 (157) pivoted at r5c9 and r5c5. I got the feeling that the last two can be replaced by another single movement?! |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Sun Jan 06, 2013 11:54 am Post subject: Jan 6 VH |
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After basics: | Code: |
+-------------+---------+------------+
| 6 3 8 | 5 9 4 | 17 17 2 |
| 4 2 1 | 7 3 8 | 5 9 6 |
| 5 7 9 | 1 2 6 | 8 3 4 |
+-------------+---------+------------+
| 1378 5 47 | 6 17 2 | 34 178 9 |
| 137 14 2 | 8 157 9 | 34 6 15 |
| 9 18 6 | 4 157 3 | 17 2 158 |
+-------------+---------+------------+
| 18 148 3 | 9 6 5 | 2 48 7 |
| 2 6 5 | 3 48 7 | 9 148 18 |
| 78 9 47 | 2 48 1 | 6 5 3 |
+-------------+---------+------------+
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Play this puzzle online at the Daily Sudoku site
After the first two XY wings there is also a 178 pivot r6c7 which ends it.
Colouring on 8s setting r7c8 to 4 will do it in one, but I suspect I'm missing something
simpler. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jan 06, 2013 4:28 pm Post subject: |
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| My two X-Wings were on 158 and 471. I must've missed a third because I finished with an XY-Chain. Clearly a more challenging puzzle than most VHs. |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Sun Jan 06, 2013 6:40 pm Post subject: Jan 6 VH |
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A couple of different routes:
1. first a 158 XYZ wing pivot at r6c9 giving r6c7<>1, then the 147 XY wing pivot at r4c3 leading to the 157 XY wing pivot at r5c5.
2. First the two XY wings mentioned in 1 followed by a hidden 1 at r4c5 leading to a 147 XY wing pivot at r5c8. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Sun Jan 06, 2013 8:08 pm Post subject: |
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| Code: | *-----------------------------------------------------------*
| 6 3 8 | 5 9 4 | 17 17 2 |
| 4 2 1 | 7 3 8 | 5 9 6 |
| 5 7 9 | 1 2 6 | 8 3 4 |
|-------------------+-------------------+-------------------|
| 1378 5 47 | 6 17 2 | 34 178 9 |
| 137 14 2 | 8 157 9 | 34 6 15 |
| 9 b18 6 | 4 157 3 | 17 2 d158 |
|-------------------+-------------------+-------------------|
| 18 a148 3 | 9 6 5 | 2 4-8 7 |
| 2 6 5 | 3 48 7 | 9 148 d18 |
| 78 9 47 | 2 48 1 | 6 5 3 |
*-----------------------------------------------------------*
skyscraper
8r7c2=r6c2-r6c9=8r8c9 => -8r7c8; stte |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jan 07, 2013 12:38 am Post subject: |
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| Quote: | skyscraper
8r7c2=r6c2-r6c9=8r8c9 => -8r7c8; stte |
How embarrassing!!   |
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