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An old puzzle march 26, 08

 
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pbreinhart



Joined: 21 Sep 2007
Posts: 9
Location: Atlanta, GA

PostPosted: Tue Feb 09, 2016 10:32 pm    Post subject: An old puzzle march 26, 08 Reply with quote

I haven't a clue as to why a "7" is suggested for R5C7 when I click the hint button. I would very much appreciate any info. Thanks.
Here is the puzzle:
Code:

+-----------+------------+---------+
| 1 245 458 | 6   89  29 | 45 3  7 |
| 6 57  58  | 137 378 4  | 2  15 9 |
| 9 247 3   | 17  5   27 | 46 16 8 |
+-----------+------------+---------+
| 2 6   59  | 59  1   8  | 7  4  3 |
| 4 59  1   | 579 7   3  | 8  2  6 |
| 8 3   7   | 2   4   6  | 1  9  5 |
+-----------+------------+---------+
| 5 49  6   | 479 2   79 | 3  8  1 |
| 3 1   2   | 8   6   5  | 9  7  4 |
| 7 8   49  | 349 39  1  | 56 56 2 |
+-----------+------------+---------+

Play this puzzle online at the Daily Sudoku site

The numbers in that cell are 79 before the hint.
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yeoks



Joined: 16 May 2010
Posts: 33

PostPosted: Wed Feb 10, 2016 11:29 am    Post subject: Reply with quote

Code:

+-----------+------------+---------+
| 1 245 458 | 6   89  29 | 45 3  7 |
| 6 57  58  | 137 378 4  | 2  15 9 |
| 9 247 3   | 17  5   27 | 46 16 8 |
+-----------+------------+---------+
| 2 6   59  | 59  1   8  | 7  4  3 |
| 4 59  1   | 579 79  3  | 8  2  6 |
| 8 3   7   | 2   4   6  | 1  9  5 |
+-----------+------------+---------+
| 5 49  6   | 479 2   79 | 3  8  1 |
| 3 1   2   | 8   6   5  | 9  7  4 |
| 7 8   49  | 349 39  1  | 56 56 2 |
+-----------+------------+---------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 59-7 pivoted in r5c2 removes (7) from r2c5, leaving r5c5 as the only cell with a (7) in column 5.
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pbreinhart



Joined: 21 Sep 2007
Posts: 9
Location: Atlanta, GA

PostPosted: Wed Feb 10, 2016 8:36 pm    Post subject: Reply with quote

Thanks. Very clear.
Then the puzzle goes on to say that that R7C6 should be a 7. I am not sure how this is arrived at.
Code:

+-----------+-----------+---------+
| 1 245 458 | 6   89 29 | 45 3  7 |
| 6 57  58  | 137 38 4  | 2  15 9 |
| 9 247 3   | 17  5  27 | 46 16 8 |
+-----------+-----------+---------+
| 2 6   59  | 59  1  8  | 7  4  3 |
| 4 59  1   | 59  7  3  | 8  2  6 |
| 8 3   7   | 2   4  6  | 1  9  5 |
+-----------+-----------+---------+
| 5 49  6   | 47  2  7  | 3  8  1 |
| 3 1   2   | 8   6  5  | 9  7  4 |
| 7 8   49  | 34  39 1  | 56 56 2 |
+-----------+-----------+---------+

Play this puzzle online at the Daily Sudoku site
The square R7C6 is originally 79 and I don't know how to get rid of the 9 or the other 7 in the box. Thanks.
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dongrave



Joined: 06 Mar 2014
Posts: 380

PostPosted: Thu Feb 11, 2016 4:48 am    Post subject: Reply with quote

Wow! That took me too long to find! I used the 458 XYZ Wing with pivot at r1c3 which removed the 5 from r1c2 which then opened up the 24-9 XY Wing with pivot at r1c2 which removed the 9 from r7c6! Good one!
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hughwill



Joined: 05 Apr 2010
Posts: 414
Location: Birmingham UK

PostPosted: Thu Feb 11, 2016 9:46 am    Post subject: Reply with quote

dongrave wrote:
Wow! That took me too long to find! I used the 458 XYZ Wing with pivot at r1c3 which removed the 5 from r1c2 which then opened up the 24-9 XY Wing with pivot at r1c2 which removed the 9 from r7c6! Good one!


In fact the first 59-7 XY-Wing isn't required- Dongrave's two wings do it all.

Hugh
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pbreinhart



Joined: 21 Sep 2007
Posts: 9
Location: Atlanta, GA

PostPosted: Thu Feb 11, 2016 10:40 pm    Post subject: Reply with quote

Thank you both. Very impressive resolution of the puzzle.
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