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Oct 17 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania
PostPosted: Sun Oct 17, 2010 12:54 am    Post subject: Oct 17 VH Reply with quote
XY-Wing 13 39 19 Pivoted in r6c9 eliminating 1 in r4c5 solves it.
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kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
PostPosted: Sun Oct 17, 2010 5:40 am    Post subject: Oct 17 VH Reply with quote
There is a different 139 xy-wing with pivot at r4c7 eliminating 3 at r4c8 and r6c5.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sun Oct 17, 2010 3:26 pm    Post subject: Reply with quote
After basics:
Code:
+-------------+-------------+-------------+
| 6   25  4   | 3   7   1   | 28  9   58  |
| 1   29  239 | 4   58  58  | 6   23  7   |
| 35  7   8   | 9   2   6   | 4   1   35  |
+-------------+-------------+-------------+
| 59  589 7   | 2   13  4   | 19  38  6   |
| 2   3   1   | 68  689 89  | 7   5   4   |
| 4   689 69  | 5   13  7   | 129 238 39  |
+-------------+-------------+-------------+
| 389 4   39  | 7   89  2   | 5   6   1   |
| 7   26  256 | 1   56  3   | 89  4   89  |
| 89  1   56  | 68  4   589 | 3   7   2   |
+-------------+-------------+-------------+

A 56-8 XY-wing also solves it.

Keith
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