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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Tue Dec 18, 2012 10:17 pm Post subject: Dec 19 VH |
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| Code: |
+----------+-----------+----------+
| 7 9 8 | 5 4 6 | 1 3 2 |
| 24 1 6 | 27 78 3 | 5 48 9 |
| 24 3 5 | 9 1 *28 | 48 6 7 |
+----------+-----------+----------+
| 5 6 9 | 8 3 1 | 7 2 4 |
| 8 4 1 | 6 2 7 | 9 5 3 |
| 3 7 2 | 4 9 5 | 6 1 8 |
+----------+-----------+----------+
| 9 5 34 | 23 6 248 | 248 7 1 |
| 6 *28 47 | 1 78 -248 | 3 9 5 |
| 1 28 37 | 37 5 9 | 248 48 6 |
+----------+-----------+----------+
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W-Wing 28 in BOX 27 with SL 8 in col 5; r8c6<>2. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Dec 19, 2012 2:48 am Post subject: |
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| Code: |
+----------+-----------+----------+
| 7 9 8 | 5 4 6 | 1 3 2 |
| 24 1 6 | 27 78 3 | 5 48 9 |
| 24 3 5 | 9 1 28 | 48 6 7 |
+----------+-----------+----------+
| 5 6 9 | 8 3 1 | 7 2 4 |
| 8 4 1 | 6 2 7 | 9 5 3 |
| 3 7 2 | 4 9 5 | 6 1 8 |
+----------+-----------+----------+
| 9 5 34 | 23 6 248 | 248 7 1 |
| 6 28 47 | 1 78 248 | 3 9 5 |
| 1 28 37 | 37 5 9 | 248 48 6 |
+----------+-----------+----------+
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Play this puzzle online at the Daily Sudoku site
Using only the standard VH techniques, I needed three moves.
X-Wing (8), r37
X-Wing (4), c36
XYZ-Wing (248, pivot r7c6 |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Wed Dec 19, 2012 6:41 am Post subject: Dec 19 VH |
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Marty:
If you examine the intersection of r9 with box 9 in your grid you see that r7c7<>4 thus negating the x-wing in 4. After taking the x-wing in 8 the solution is either your mentioned XYZ-wing <248> or the BUG+1. |
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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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| Posted: Wed Dec 19, 2012 7:36 am Post subject: Dec 19 VH |
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| After the x-wing on 8, the xy-wing 234 pivoting in r7c4 solves the puzzle. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Dec 19, 2012 4:12 pm Post subject: |
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Thanks. I can't seem to shed the problem of missing some basics from time to time.  |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Wed Dec 19, 2012 9:20 pm Post subject: yet another almost an xy wing is a single stepper |
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| assume that r8c6 <> 8 then XY 234 pivoted at r7c4 quickly leads to r8c5=8, So r7c6 cannot be 8 and this solves it |
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