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The Daily Sudoku for 25/3/2016-Diabolical

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Fri Mar 25, 2016 8:33 pm    Post subject: The Daily Sudoku for 25/3/2016-Diabolical Reply with quote

Code:

+-------+-------+-------+
| 5 . . | . 4 . | . 2 . |
| 3 . . | . . . | . . 1 |
| . 6 9 | . . . | . . . |
+-------+-------+-------+
| . 2 . | 6 5 . | . . 3 |
| . . 5 | 3 . 2 | 9 . . |
| 9 . . | . 1 8 | . 7 . |
+-------+-------+-------+
| . . . | . . . | 1 9 . |
| 6 . . | . . . | . . 5 |
| . 4 . | . 2 . | . . 8 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Mon Mar 28, 2016 9:13 pm    Post subject: Daily Sudoku for 25/3/2016-Diabolical Reply with quote

Code:

+---------------+-----------+--------------+
| 5    178 18   | 78 4  367 | 3678 2    9  |
| 3    78  24   | 25 9  67  | 4678 4568 1  |
| b24   6   9    | 25 38 1   | 3478 3458 a47 |
+---------------+-----------+--------------+
| 1478 2   1478 | 6  5  9   | 48   148  3  |
| 148  18  5    | 3  7  2   | 9    148  6  |
| 9    3   6    | 4  1  8   | 5    7    2  |
+---------------+-----------+--------------+
| c278  5   d2378 | 78 6  e347 | 1    9    f4-7 |
| 6    9   378  | 1  38 347 | 2    34   5  |
| 17   4   137  | 9  2  5   | 367  36   8  |
+---------------+-----------+--------------+

(7=4)r3c9 - (4=2)r3c1 - r7c1 = (2-3)r7c3 = (3-4)r7c6 = (4)r7c9 => - 7 r7c9; stte
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Mon Mar 28, 2016 10:28 pm    Post subject: Reply with quote

Hey! Wait a minute. I found a chain that eliminated the 7 from r7c9 too but I got stuck finishing it with basics so I gave up since it didn't appear to be a one-stepper. Darn it all. I got down to a bunch of interconnected cells but no obvious way to proceed.

Edit: I just went back and checked my worksheet Clement. Are you sure that r7c9 solves it? (I still don't see it.) I had cells r2c34, r3c14, and r4c6 circled as possible one-steppers and I had a big 'NO!' pointing to r7c9 along with light slashes through all the cells that I was able to solve from it.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Tue Mar 29, 2016 12:32 pm    Post subject: Reply with quote

dongrave wrote:
Hey! Wait a minute. I found a chain that eliminated the 7 from r7c9 too but I got stuck finishing it with basics so I gave up since it didn't appear to be a one-stepper. Darn it all. I got down to a bunch of interconnected cells but no obvious way to proceed.

Edit: I just went back and checked my worksheet Clement. Are you sure that r7c9 solves it? (I still don't see it.) I had cells r2c34, r3c14, and r4c6 circled as possible one-steppers and I had a big 'NO!' pointing to r7c9 along with light slashes through all the cells that I was able to solve from it.

You are right. I must have inserted a correct number erroneously in the process of completing it. After eliminating 7 in r7c9 the grid which follows is like this
Code:

+---------+--------+----------+
| 5  7 1  | 8  4 6 | 3  2   9 |
| 3  8 24 | 25 9 7 | 6  45  1 |
| 24 6 9  | 25 3 1 | 48 458 7 |
+---------+--------+----------+
| 7  2 48 | 6  5 9 | 48 1   3 |
| 48 1 5  | 3  7 2 | 9  48  6 |
| 9  3 6  | 4  1 8 | 5  7   2 |
+---------+--------+----------+
| 28 5 28 | 7  6 3 | 1  9   4 |
| 6  9 7  | 1  8 4 | 2  3   5 |
| 1  4 3  | 9  2 5 | 7  6   8 |
+---------+--------+----------+

Which can be completed by BUG+1; r3c8=4 or other techniques. I am sorry for the inconvenience.
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