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Feb 21 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Mon Feb 20, 2012 11:02 pm    Post subject: Feb 21 VH Reply with quote
W-Wing 26 with SL 2 in row 7; r8c3<>6 solves it.
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TerenceF



Joined: 21 Dec 2007
Posts: 26
Location: Takapuna, NZ
PostPosted: Mon Feb 20, 2012 11:24 pm    Post subject: Reply with quote
Code:

+-------------+--------------+-------------+
| 269 4   58  | 3   256  25  | 1    7   89 |
| 679 679 58  | 567 4    1   | 39   389 2  |
| 27  1   3   | 27  8    9   | 4    5   6  |
+-------------+--------------+-------------+
| 13  79  79  | 4   15   6   | 2    38  58 |
| 8   5   26  | 29  7    23  | 369  4   1  |
| 13  26  4   | 8   1259 235 | 3569 39  7  |
+-------------+--------------+-------------+
| 5   8   29  | 1   29   4   | 7    6   3  |
| 4   267 267 | 26  3    8   | 59   1   59 |
| 69  3   1   | 569 569  7   | 8    2   4  |
+-------------+--------------+-------------+

Another way to demonstrate that r8c3<>6 is to use the 269 XY-wing pivoted on r7c3, which gives the same result.
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