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Very Hard IV

 
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Thu Jun 22, 2017 9:21 pm    Post subject: Very Hard IV Reply with quote
Hi everyone

Code:

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

Play this puzzle online at the Daily Sudoku site

Ciao a Tutti
Paolo
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Sun Jun 25, 2017 11:36 am    Post subject: Reply with quote
Hi everyone

Code:

+-------------------+-------------------+------------------+
| 158   1578  2     | 3     478  467    | 1568  9    4567  |
| 1389  6     3789  | 24789 5    2479   | 1238  1478 2347  |
| 4     578   35789 | 26789 278  1      | 23568 5678 23567 |
+-------------------+-------------------+------------------+
| 7     258   36    | 1289  1238 2359   | 4     156  2569  |
| 258   9     458   | 12478 6    2457   | 125   3    257   |
| 36    245   1     | 2479  2347 234579 | 2569  567  8     |
+-------------------+-------------------+------------------+
| 1689  3     46789 | 5     147  467    | 689   2    469   |
| 2568  24578 45678 | 2467  9    23467  | 3568  4568 1     |
| 12569 1245  4569  | 1246  1234 8      | 7     456  34569 |
+-------------------+-------------------+------------------+

Play this puzzle online at the Daily Sudoku site

I use single and Nishio
If R2C7=3 => Nishio contradiction with only basic startegies=> R7C5 ≠ 7;R6C8 ≠ 7;R6C6 ≠ 7;R7C3 ≠ 7;R7C1 ≠ 1;R6C7≠ 2;R6C7 ≠ 5 and R6C8 ≠ 5; => solution stte

Ciao a tutti
Paolo
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