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Difficulty too hard

 
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Mon May 08, 2017 10:06 pm    Post subject: Difficulty too hard Reply with quote

Code:

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

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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Tue May 09, 2017 1:44 pm    Post subject: Reply with quote

7r2c8 -> 0 solution via HP(78)L1C56 and XWing(8R57); r9c8=7; stte
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Tue May 09, 2017 10:45 pm    Post subject: Reply with quote

If R5C8≠1-->naked pair (8,9)R4C8 and R5C8-->delete 9 in R2C8 and in R3C8 , 8 in R9C8-->solution with basic strategies.
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Skillosacv



Joined: 16 May 2017
Posts: 2

PostPosted: Mon May 22, 2017 4:52 am    Post subject: Reply with quote

It would be great if we could talk about this issue.
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Mon May 22, 2017 11:52 am    Post subject: Reply with quote

Hi Skillosacv
after basic strategies
Code:

+-----------------+-----------------+-----------------+
| 1     459  3459 | 6    5789 4789  | 4579  2    345  |
| 2459  8    6    | 247  3    2479  | 14579 179  145  |
| 2459  7    3459 | 1    259  249   | 8     69   3456 |
+-----------------+-----------------+-----------------+
| 3     6    4589 | 278  278  1     | 2459  89   2458 |
| 89    129  7    | 5    4    3     | 6     189  128  |
| 458   1245 1458 | 9    28   6     | 1245  3    7    |
+-----------------+-----------------+-----------------+
| 6789  19   2    | 3    1789 5     | 17    4    168  |
| 4789  149  1489 | 2478 6    24789 | 3     5    128  |
| 45678 3    1458 | 2478 1278 2478  | 127   1678 9    |
+-----------------+-----------------+-----------------+

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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Mon May 22, 2017 11:58 am    Post subject: Reply with quote

after hypothesis

If R5C8=1 is false-->naked pair (8,9)R4C8 and R5C8-->delete 9 in R2C8 and in R3C8 , 8 in R9C8
Code:

+-----------------+-----------------+----------------+
| 1     459  3459 | 6    5789 4789  | 4579  2   345  |
| 2459  8    6    | 247  3    2479  | 14579 17  145  |
| 2459  7    3459 | 1    259  249   | 8     6   3456 |
+-----------------+-----------------+----------------+
| 3     6    4589 | 278  278  1     | 2459  89  2458 |
| 89    129  7    | 5    4    3     | 6     89  128  |
| 458   1245 1458 | 9    28   6     | 1245  3   7    |
+-----------------+-----------------+----------------+
| 6789  19   2    | 3    1789 5     | 17    4   168  |
| 4789  149  1489 | 2478 6    24789 | 3     5   128  |
| 45678 3    1458 | 2478 1278 2478  | 127   167 9    |
+-----------------+-----------------+----------------+

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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Mon May 22, 2017 1:09 pm    Post subject: Reply with quote

Naked triple (247),r2c4,r2c6 and r3c6, -7 r1c56,-4 r1c6, -2 r3c5. Solution basic strategies.
Code:

+--------------+--------------+------------+
| 1   45   349 | 6   5789 478 | 457 2  345 |
| 245 8    6   | 47  3    247 | 9   17 145 |
| 245 7    349 | 1   259  24  | 8   6  345 |
+--------------+--------------+------------+
| 3   6    48  | 78  278  1   | 45  9  245 |
| 9   12   7   | 5   4    3   | 6   8  12  |
| 245 1245 148 | 9   28   6   | 145 3  7   |
+--------------+--------------+------------+
| 8   9    2   | 3   17   5   | 17  4  6   |
| 7   14   14  | 2   6    9   | 3   5  8   |
| 6   3    5   | 478 178  478 | 2   17 9   |
+--------------+--------------+------------+

Play this puzzle online at the Daily Sudoku site
Code:

+--------------+-------------+------------+
| 1   45   349 | 6   589 8   | 457 2  345 |
| 245 8    6   | 47  3   247 | 9   17 145 |
| 245 7    349 | 1   59  24  | 8   6  345 |
+--------------+-------------+------------+
| 3   6    48  | 78  278 1   | 45  9  245 |
| 9   12   7   | 5   4   3   | 6   8  12  |
| 245 1245 148 | 9   28  6   | 145 3  7   |
+--------------+-------------+------------+
| 8   9    2   | 3   17  5   | 17  4  6   |
| 7   14   14  | 2   6   9   | 3   5  8   |
| 6   3    5   | 478 178 478 | 2   17 9   |
+--------------+-------------+------------+

Play this puzzle online at the Daily Sudoku site
Code:

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

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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Mon May 22, 2017 2:05 pm    Post subject: Reply with quote

Hi everyone

Sorry, but the scheme I have proposed to more than one solution.


Ciao a tutti
Paolo
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Mon May 22, 2017 4:48 pm    Post subject: Reply with quote

Hi everyone.

Errata corrige. My previoues post is wrong. The puzzle have only one solution.

Ciao a tutti
Paolo
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