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Aug 3 VH

 
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Fri Aug 03, 2012 3:51 am    Post subject: Aug 3 VH Reply with quote

I thought once in my life I should start a topic. Being on the early end of the planet (Australia), I hope I'm not being TOO early for today's puzzle.

I found no less than 3 xyz wings. Just one of them was useful, with fulcrum 359. It eliminated a 3, setting up an xy wing 139. The xy wing pinched on 1 and led to the solution.

I'll let somebody else spell this out more fully.


Last edited by RobertRattley on Mon Aug 13, 2012 2:03 pm; edited 1 time in total
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hughwill



Joined: 05 Apr 2010
Posts: 190
Location: Birmingham UK

PostPosted: Fri Aug 03, 2012 9:58 am    Post subject: Aug 3 VH Reply with quote

Code:

+--------------+-----------------+-------------+
| 147 137  37  | 157   2    8    | 145  9  6   |
| 147 5    2   | 1379  6    1379 | 134  13 8   |
| 9   8    6   | 135   35   4    | 7    2  135 |
+--------------+-----------------+-------------+
| 5   9    4   | 13    8    6    | 13   7  2   |
| 27  27   1   | 4     39   5    | 8    6  39  |
| 3   6    8   | 1279  79   1279 | 159  15 4   |
+--------------+-----------------+-------------+
| 12  123  5   | 6     4    239  | 1239 8  7   |
| 8   1237 379 | 23579 3579 2379 | 6    4  139 |
| 6   4    379 | 8     1    2379 | 2359 35 359 |
+--------------+-----------------+-------------+

Play this puzzle online at the Daily Sudoku site

Grid after basics. I also found the obvious 135 XY wing which removes a
couple of 3s in column 7 but leads to nothing....
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arkietech



Joined: 31 Jul 2008
Posts: 1723
Location: Northwest Arkansas USA

PostPosted: Fri Aug 03, 2012 3:18 pm    Post subject: Reply with quote

Code:
 *-----------*
 |...|.28|.96|
 |.52|.6.|..8|
 |986|..4|72.|
 |---+---+---|
 |594|.86|.72|
 |..1|4.5|86.|
 |368|...|..4|
 |---+---+---|
 |..5|64.|.87|
 |8..|...|64.|
 |64.|81.|...|
 *-----------*

 
 *--------------------------------------------------------------------*
 | 147    137    37     | 157    2      8      | 145    9      6      |
 | 147    5      2      | 1379   6      1379   | 134   a13     8      |
 | 9      8      6      | 135    35     4      | 7      2     d35-1   |
 |----------------------+----------------------+----------------------|
 | 5      9      4      | 13     8      6      | 13     7      2      |
 | 27     27     1      | 4      39     5      | 8      6      39     |
 | 3      6      8      | 1279   79     1279   | 159    15     4      |
 |----------------------+----------------------+----------------------|
 | 12     123    5      | 6      4      239    | 1239   8      7      |
 | 8      1237   379    | 23579  3579   2379   | 6      4      139    |
 | 6      4      379    | 8      1      2379   | 2359  b35    c359    |
 *--------------------------------------------------------------------*
H2-wing
(1=3)r2c8-(3=5)r9c8-r9c9=5r3c9 => -1r3c9

either r2c8 is a 1 or r3c9 is a 5 r3c9 cannot be a 1
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