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Dec 11 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
PostPosted: Sat Dec 10, 2011 11:48 pm    Post subject: Dec 11 VH Reply with quote
Well, two steps for me.
W-Wing 49 with SL 9 in col 7; r7c4<>4 opens an XY-Wing 49 79 47 pivoted in r7c4; r6c2<>4 which solves it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Dec 11, 2011 2:25 am    Post subject: Reply with quote
XY-Wing (479);r8c2<>9.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sun Dec 11, 2011 12:11 pm    Post subject: Reply with quote
Code:
*--------------------------------------------------*
 | 2    3    6    |*49   5    8    |*79   47-9 1    |
 | 4    8    9    | 1    3    7    | 2    6    5    |
 | 7    1    5    | 2    46   469  | 8    49   3    |
 |----------------+----------------+----------------|
 | 9    7    38   | 6    2    5    | 1    38   4    |
 | 6    5    34   | 8    47   1    | 37   2    9    |
 | 1    24   248  | 47   9    3    | 6    5    78   |
 |----------------+----------------+----------------|
 | 5    49   1    |*479  478  2    |*379  38   6    |
 | 8    469  47   | 3    1    469  | 5    79   2    |
 | 3    269  27   | 5    678  69   | 4    1    78   |
 *--------------------------------------------------*
x-wing
(9)r1c4=(9)r7c4-(9)r7c7=(9)r1c7 => r1c8<>9
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