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pbreinhart
Joined: 21 Sep 2007
Posts: 9
Location: Atlanta, GA
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 Posted: Tue Feb 09, 2016 10:32 pm Post subject: An old puzzle march 26, 08 |
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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 |
+-----------+------------+---------+
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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
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| Posted: Wed Feb 10, 2016 11:29 am Post subject: |
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| 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
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| Posted: Wed Feb 10, 2016 8:36 pm Post subject: |
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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: 572
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| Posted: Thu Feb 11, 2016 4:48 am Post subject: |
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| 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: 424
Location: Birmingham UK
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| Posted: Thu Feb 11, 2016 9:46 am Post subject: |
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| 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
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| Posted: Thu Feb 11, 2016 10:40 pm Post subject: |
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| Thank you both. Very impressive resolution of the puzzle. |
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