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Feb 21 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 656
Location: Dar es Salaam Tanzania

PostPosted: Sun Feb 20, 2011 10:08 pm    Post subject: Feb 21 VH Reply with quote

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

PostPosted: Sun Feb 20, 2011 10:55 pm    Post subject: Reply with quote

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: 5119
Location: Rochester, NY, USA

PostPosted: Mon Feb 21, 2011 1:29 am    Post subject: Reply with quote

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 |
+--------+----------+----------+

Play this puzzle online at the Daily Sudoku site
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kuskey



Joined: 10 Dec 2008
Posts: 124
Location: Pembroke, NH

PostPosted: Mon Feb 21, 2011 5:44 am    Post subject: 21 Feb VH Reply with quote

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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