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Oct 8 VH

 
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Clement



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

PostPosted: Fri Oct 07, 2011 10:34 pm    Post subject: Oct 8 VH Reply with quote

XY-Wing 68 89 69 pivoted in r1c7; r2c7<>6 solves it.
Also the XYZ-Wing 789 with apex in r5c7; r6c7<>9.
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arkietech



Joined: 31 Jul 2008
Posts: 1719
Location: Northwest Arkansas USA

PostPosted: Sat Oct 08, 2011 7:47 am    Post subject: Reply with quote

r2c3 has two strong links (9) hooked up with a chain.
Code:
 *-----------------------------------------------------------*
 | 6    a59    3     | 7     2     58    |b89    4     1     |
 | 2     4    *5(9)  | 1     3     58    | 6789  68    79    |
 | 8     1     7     | 6     4     9     | 2     5     3     |
 |-------------------+-------------------+-------------------|
 | 7     68    2     | 9     5     3     | 1     68    4     |
 | 5     3    d89    | 4     1     6     |c789   2     79    |
 | 4     69    1     | 2     8     7     | 69    3     5     |
 |-------------------+-------------------+-------------------|
 | 1     58    58    | 3     9     2     | 4     7     6     |
 | 3     7     4     | 8     6     1     | 5     9     2     |
 | 9     2     6     | 5     7     4     | 3     1     8     |
 *-----------------------------------------------------------*
 (9)r2c3=(9)r1c2-(9=8)r1c7-(8)r5c7=(8-9)r5c3=(9)r2c3 => r2c3=9
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