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Clement
Joined: 24 Apr 2006 Posts: 1110 Location: Dar es Salaam Tanzania
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Posted: Sun Feb 03, 2013 11:22 pm Post subject: Feb 4 VH |
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Code: |
+------------------+-----------+---------------+
| 1 5 -489 | 48 2 47 | 6 3 79 |
| 26789 24678 4689 | 5 78 3 | 478 4789 1 |
| 78 3 48 | 9 1 6 | 4-78 5 2 |
+------------------+-----------+---------------+
| 25689 26 7 | 1 4 29 | 23 268 356 |
| 25 1 3 | 7 6 8 | 9 24 45 |
| 2689 246 4689 | 3 5 29 | 1 2678 67 |
+------------------+-----------+---------------+
| 4 678 1 | 68 789 5 | 23 2679 3679 |
| 3 678 5 | 2 789 1 | 47 4679 4679 |
| 67 9 2 | 46 3 47 | 5 1 8 |
+------------------+-----------+---------------+
| X-Wing on 4 in col 46; r1c3<>4 opens
an XY-Wing 78-89-79 pivoted in r1c3; r3c7<>7 which solves it. |
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Clement
Joined: 24 Apr 2006 Posts: 1110 Location: Dar es Salaam Tanzania
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Posted: Sun Feb 03, 2013 11:40 pm Post subject: Feb 4 VH |
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Sorry, the x-wing in my above submission is not needed, the locked 4's in BOX 2 eliminate the 4 in r1c3. Only the xy- wing solves it. |
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George Woods
Joined: 28 Mar 2006 Posts: 304 Location: Dorset UK
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Posted: Mon Feb 04, 2013 11:11 am Post subject: w wing solution |
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the w wing using 78 in boxes 1 and 2 operating on 8s in row 1 make r3c1 7 and solve it |
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