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May 4 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Fri May 03, 2013 10:27 pm    Post subject: May 4 VH Reply with quote
Code:

+--------+----------+----------+
| 4 6 1  | 9  58 38 | 2  35  7 |
| 9 8 3  | 56 7  2  | 56 1   4 |
| 7 5 2  | 13 #16 4  | *69 39  8 |
+--------+----------+----------+
| 3 7 9  | 2  4  5  | 8  6   1 |
| 8 2 46 | 13 *19 36 | 7-9 479 5 |
| 5 1 46 | 7  89 68 | 3  49  2 |
+--------+----------+----------+
| 6 4 5  | 8  3  7  | 1  2   9 |
| 1 3 8  | 4  2  9  | 57 57  6 |
| 2 9 7  | 56 56 1  | 4  8   3 |
+--------+----------+----------+
XY-Wing 19-16-69 pivoted in r3c5; r5c7<>9, stte.
Also BUG+1; r5c8=9.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat May 04, 2013 3:38 am    Post subject: Reply with quote
This is the 2nd consecutive VH where the basics reduced the grid to a BUG+1.
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jay



Joined: 19 Feb 2013
Posts: 10
Location: Grove, Oklahoma
PostPosted: Sat May 04, 2013 7:32 pm    Post subject: Reply with quote
I am too blinded to see how you got so many eliminations. I actually solved this puzzle once, and decided to see what others had to say. My solution was not the same as here. I probably made a mistake that was a lucky one!
What basics am I overlooking here?
Oops. Soon as I post this, my eyes can see.
The sixes in c6 eliminate the rest of the 6s in box 5, and then some more basics leading to the 1-6-9 xy wing


Code:

+--------+---------------+----------+
| 4 6 1  | 9   358   38  | 2  35  7 |
| 9 8 3  | 567 567   2   | 56 1   4 |
| 7 5 2  | 13  136   4   | 69 39  8 |
+--------+---------------+----------+
| 3 7 9  | 2   4     5   | 8  6   1 |
| 8 2 46 | 13  13679 367 | 79 479 5 |
| 5 1 46 | 67  6789  678 | 3  479 2 |
+--------+---------------+----------+
| 6 4 5  | 8   37    37  | 1  2   9 |
| 1 3 8  | 4   2     9   | 57 57  6 |
| 2 9 7  | 56  56    1   | 4  8   3 |
+--------+---------------+----------+

Play this puzzle online at the Daily Sudoku site
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