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Jun 24 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 656
Location: Dar es Salaam Tanzania

PostPosted: Sat Jun 23, 2012 10:16 pm    Post subject: Jun 24 VH Reply with quote

XY-Wing 57 78 58 pivoted in r3c8 solves it by setting r7c2<>5.
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dongrave



Joined: 06 Mar 2014
Posts: 17

PostPosted: Thu Mar 06, 2014 2:43 pm    Post subject: Jun 24 2012 VH Reply with quote

I'm going back through the archive now to try to solve the VH ones. How did you eliminate the candidate 5 from r3c8? I had the candidates 578 instead of just 78 in r3c8 so I missed the XY wing. Thanks.
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Marty R.



Joined: 12 Feb 2006
Posts: 5120
Location: Rochester, NY, USA

PostPosted: Thu Mar 06, 2014 5:49 pm    Post subject: Reply with quote

Code:

+--------------+--------+-------------+
| 16   8  56   | 7 15 9 | 4   3   2   |
| 17   3  2    | 4 6  8 | 159 579 579 |
| 4    57 9    | 3 15 2 | 158 578 6   |
+--------------+--------+-------------+
| 578  9  4    | 1 2  3 | 58  6   578 |
| 57   2  1    | 8 79 6 | 3   579 4   |
| 3678 67 3678 | 5 79 4 | 2   1   789 |
+--------------+--------+-------------+
| 9    56 568  | 2 4  1 | 7   58  3   |
| 37   4  37   | 9 8  5 | 6   2   1   |
| 2    1  58   | 6 3  7 | 589 4   589 |
+--------------+--------+-------------+

Play this puzzle online at the Daily Sudoku site

I don't know if I'm done with basics yet. But look at row 2. The 5s are restricted to row 2 in box 3, thus no other rows in that box can contain 5.
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dongrave



Joined: 06 Mar 2014
Posts: 17

PostPosted: Thu Mar 06, 2014 6:21 pm    Post subject: Reply with quote

Oh! How obvious! How did I miss that? I actually still had a 5 in r1c1 and r2c1 even though I knew that r4c1 or r5c1 had to be a 5. Thanks!
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Marty R.



Joined: 12 Feb 2006
Posts: 5120
Location: Rochester, NY, USA

PostPosted: Thu Mar 06, 2014 9:00 pm    Post subject: Reply with quote

That situation in row 2 is called either Locked Candidates or Box-Line Interactions and are extremely easy to miss. Many people miss them, including myself.
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