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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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 Posted: Sun Feb 20, 2011 10:08 pm Post subject: Feb 21 VH |
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| W-Wing 24 with strong link 2 in column 8; r1c6<>4 solves it. Also the other one with strong link 4 in col 7; r2c5<>2. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Sun Feb 20, 2011 10:55 pm Post subject: |
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| A five minute puzzle that almost solved itself. Very few unsolved cells after basics, needing a a 246 XY wing to clinch it. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Feb 21, 2011 1:29 am Post subject: |
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This is what I had after basics. There are at least a half-dozen techniques that can be used.
| Code: |
+--------+----------+----------+
| 24 5 7 | 1 9 46 | 8 26 3 |
| 24 3 8 | 7 246 5 | 46 9 1 |
| 1 6 9 | 3 24 8 | 45 25 7 |
+--------+----------+----------+
| 6 8 3 | 4 7 9 | 2 1 5 |
| 7 2 4 | 6 5 1 | 3 8 9 |
| 5 9 1 | 2 8 3 | 7 4 6 |
+--------+----------+----------+
| 9 4 5 | 8 16 7 | 16 3 2 |
| 3 7 2 | 9 146 46 | 156 56 8 |
| 8 1 6 | 5 3 2 | 9 7 4 |
+--------+----------+----------+
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Play this puzzle online at the Daily Sudoku site |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Mon Feb 21, 2011 5:44 am Post subject: 21 Feb VH |
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Lots of ways to skin this cat. I'm not sure I got them all, but here goes:
1. three versions of the 246 XY-Wing
2. two versions of the 24 W-Wing
3. a 46 W-Wing
those are all one-steppers
What I find interesting is a series of two-steppers, all of which use a different technique in step one to set r8c57<>6. These are a type-4 UR on 16 in c78 and two versions of an X-Wing. All reveal the second step, which can be either a 145 XY-Wing or a BUG+1.
not sure I would bet the farm on all this but it was fun hunting. |
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