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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Sat Jan 26, 2013 10:26 pm Post subject: Jan 27 VH |
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| 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 |
+-------+--------+------------+
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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: 304
Location: Dorset UK
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| Posted: Sun Jan 27, 2013 10:39 am Post subject: w wing on 34 is almost identical to xy wing |
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| 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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