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Dec 19 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 668
Location: Dar es Salaam Tanzania

PostPosted: Tue Dec 18, 2012 10:17 pm    Post subject: Dec 19 VH Reply with quote

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 |
+----------+-----------+----------+
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: 5160
Location: Rochester, NY, USA

PostPosted: Wed Dec 19, 2012 2:48 am    Post subject: Reply with quote

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 |
+----------+-----------+----------+

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: 127
Location: Pembroke, NH

PostPosted: Wed Dec 19, 2012 6:41 am    Post subject: Dec 19 VH Reply with quote

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: 72
Location: Sweden

PostPosted: Wed Dec 19, 2012 7:36 am    Post subject: Dec 19 VH Reply with quote

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: 5160
Location: Rochester, NY, USA

PostPosted: Wed Dec 19, 2012 4:12 pm    Post subject: Reply with quote

Thanks. I can't seem to shed the problem of missing some basics from time to time. Embarassed
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George Woods



Joined: 28 Mar 2006
Posts: 232
Location: Dorset UK

PostPosted: Wed Dec 19, 2012 9:20 pm    Post subject: yet another almost an xy wing is a single stepper Reply with quote

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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