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Aug 30 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 664
Location: Dar es Salaam Tanzania

PostPosted: Wed Aug 29, 2012 10:46 pm    Post subject: Aug 30 VH Reply with quote

Code:

+-----------+----------+----------+
| 7 8   5   | 9  6   3 | 2  1   4 |
| 4 3   2   | 7  1   8 | 5  9   6 |
| 1 9   6   | 2  5   4 | 78 78  3 |
+-----------+----------+----------+
| 5 2   3   | 1  9   6 | 48 48  7 |
| 6 47  478 | 5  48  2 | 1  3   9 |
| 9 1   48  | 38 348 7 | 6  5   2 |
+-----------+----------+----------+
| 3 467 9   | 68 78  5 | 47 2   1 |
| 8 67  1   | 4  2   9 | 3  67  5 |
| 2 5   47  | 36 37  1 | 9  467 8 |
+-----------+----------+----------+
W-Wing 47 in BOX 79 with SL 7 in Col 5; r9c8<>4 solves it in one step.
Also two xy-wings: XY-Wing 47 48 78 pivoted in r5c5; r7c2<>7 which opens another XY-Wing 67 46 47 with pivot in r7c2; r8c8<>7.
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