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Jan 27 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 638
Location: Dar es Salaam Tanzania

PostPosted: Sat Jan 26, 2013 10:26 pm    Post subject: Jan 27 VH Reply with quote

Code:

+-------+--------+------------+
| 5 6 8 | 1 7  3 | 2   *49 -49  |
| 4 1 3 | 8 9  2 | 6   5  7   |
| 9 7 2 | 4 6  5 | 3   1  8   |
+-------+--------+------------+
| 8 5 4 | 2 13 7 | 19  #39 6   |
| 7 3 6 | 9 14 8 | 145 2  145 |
| 2 9 1 | 5 34 6 | 8   7  *34  |
+-------+--------+------------+
| 6 8 5 | 7 2  9 | 14  34 134 |
| 1 2 7 | 3 8  4 | 59  6  59  |
| 3 4 9 | 6 5  1 | 7   8  2   |
+-------+--------+------------+
XY-Wing 49-39-34 pivoted in r4c8; r1c9<>4 solves it.
Also W-Wing 14 in BOX 59 with SL 1 in row 4; r5c7<>4.
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George Woods



Joined: 28 Mar 2006
Posts: 231
Location: Dorset UK

PostPosted: Sun Jan 27, 2013 10:39 am    Post subject: w wing on 34 is almost identical to xy wing Reply with quote

The Xy wing quoted by clement is of a type that is moderately easy to spot. The elements of the XY are in col 8 in what I think of as a 'tight triad' but the 34 in box 6 gives the same numerical tight triad but not in a straight line so it becomes an Xy wing. But the two 34s also form a w wing that gives almost the same subsequent moves! so the XY and W wings are highly related in this example!
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