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Jul 18 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Tue Jul 17, 2012 10:37 pm    Post subject: Jul 18 VH Reply with quote

After the Basics
Code:

+------------+-----------+--------+
| 58 3  58   | 9 26  26  | 1  7 4 |
| 7  2  9    | 4 8   1   | 5  3 6 |
| 4  1  6    | 5 7   3   | 8  2 9 |
+------------+-----------+--------+
| 6  58 258  | 3 25  7   | 9  4 1 |
| 1  4  3    | 6 9   8   | 2  5 7 |
| *25 9  7    | 1 245 #24  | 3  6 8 |
+------------+-----------+--------+
| 2-58 58 2458 | 7 1   *45  | 6  9 3 |
| 9  67 45   | 8 3   456 | 47 1 2 |
| 3  67 1    | 2 46  9   | 47 8 5 |
+------------+-----------+--------+
I used two XY-Wings
XY-Wing 245 pivoted in r6c6; r7c1<>5 opens another
XY-Wing 258 pivoted in r7c1; r4c2<>5.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Wed Jul 18, 2012 10:54 am    Post subject: Reply with quote

Code:
 *-----------------------------------------------------------*
 | 58    3    *58    | 9     26    26    | 1     7     4     |
 | 7     2     9     | 4     8     1     | 5     3     6     |
 | 4     1     6     | 5     7     3     | 8     2     9     |
 |-------------------+-------------------+-------------------|
 | 6    #58   #258   | 3     25    7     | 9     4     1     |
 | 1     4     3     | 6     9     8     | 2     5     7     |
 | 25    9     7     | 1     245   24    | 3     6     8     |
 |-------------------+-------------------+-------------------|
 | 258  *58    248-5 | 7     1     45    | 6     9     3     |
 | 9     67    4-5   | 8     3     456   | 47    1     2     |
 | 3     67    1     | 2     46    9     | 47    8     5     |
 *-----------------------------------------------------------*
w-wing
(5=8)r1c3-r4c3=r4c2-(8=5)r7c2 => -5r78c3

if r1c3 is not 5 then r7c2 is 5
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