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Jan 21 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Sun Jan 20, 2013 11:12 pm    Post subject: Jan 21 VH Reply with quote

Code After Basics
Code:

+----------+-------+----------+
| 47 6  8  | 9 3 5 | 1 2  4-7  |
| 29 23 1  | 7 8 4 | 5 69 36  |
| 5  3-7 49 | 1 6 2 | 8 79 347 |
+----------+-------+----------+
| 3  5  7  | 4 9 8 | 6 1  2   |
| 6  49 49 | 2 1 3 | 7 5  8   |
| 8  1  2  | 5 7 6 | 4 3  9   |
+----------+-------+----------+
| 27 27 5  | 6 4 9 | 3 8  1   |
| 49 49 3  | 8 5 1 | 2 67 67  |
| 1  8  6  | 3 2 7 | 9 4  5   |
+----------+-------+----------+
XY-Wing 47-49-79 pivoted in r3c3; r1c9<>7, r3c2<>7 solves it.
Also same pivoted in r3c8; r1c1<>4.
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hughwill



Joined: 05 Apr 2010
Posts: 214
Location: Birmingham UK

PostPosted: Mon Jan 21, 2013 9:21 am    Post subject: Jan 21 VH Reply with quote

Or the 347 XYZ wing setting r3c8 to 9 finishes it. (Someone
will also no doubt point to a BUG+1 - I've not really mastered
those but from what I understand, this puzzle has one.....)
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Mon Jan 21, 2013 4:37 pm    Post subject: Reply with quote

Yes, this puzzle has a BUG+1. Feel free to ask if you want more information. In the meantime, here is a brief explanation.

http://www.brainbashers.com/sudokubugremoval.asp
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