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Dec 29 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 71
Location: Sweden

PostPosted: Thu Dec 29, 2011 8:42 am    Post subject: Dec 29 VH Reply with quote

No advanced method at all! Did I make a lucky mistake?
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Clement



Joined: 24 Apr 2006
Posts: 657
Location: Dar es Salaam Tanzania

PostPosted: Thu Dec 29, 2011 9:11 am    Post subject: Re: Dec 29 VH Reply with quote

roaa wrote:
No advanced method at all! Did I make a lucky mistake?
I think so.
I have to use a two stepper solution. XY-Wing 679 pivoted in r5c1; r9c2<>9 and the x-wing on 4 in col 58; r1c7<>4 and r6c4<>4.
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hughwill



Joined: 05 Apr 2010
Posts: 167
Location: Birmingham UK

PostPosted: Thu Dec 29, 2011 11:02 am    Post subject: Re: Dec 29 VH Reply with quote

Code:

+-------------+------------+-------------+
| 3  6   5    | 9   48 248 | 1247 247 17 |
| 79 179 19   | 24  6  3   | 1247 8   5  |
| 4  2   8    | 7   1  5   | 3    6   9  |
+-------------+------------+-------------+
| 8  79  69   | 1   3  46  | 47   5   2  |
| 67 5   4    | 268 78 268 | 9    1   3  |
| 1  3   2    | 5   47 9   | 8    47  6  |
+-------------+------------+-------------+
| 5  4   7    | 3   2  1   | 6    9   8  |
| 2  8   136  | 46  9  46  | 5    37  17 |
| 69 19  1369 | 68  5  7   | 12   23  4  |
+-------------+------------+-------------+

Play this puzzle online at the Daily Sudoku site

I certainly needed the XY wing setting r9c2 mentioned by Clement (the second 679 XY setting r2c3 to 1 appears to lead nowhere) but after this it seems to come out without the X wing.....
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Marty R.



Joined: 12 Feb 2006
Posts: 5126
Location: Rochester, NY, USA

PostPosted: Thu Dec 29, 2011 4:50 pm    Post subject: Reply with quote

I used Clement's two moves, in reverse order, but it doesn't matter.
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