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Ajò Dimonios

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

Posted: Thu Jun 08, 2017 10:05 pm Post subject: Hard puzzle II

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Hi everyone

Code:

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

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

Posted: Fri Jun 09, 2017 10:58 am Post subject:

Hi everyone If R2C5=1=>Solution stte. It is possible to prove that R2C5<>3, R2<>4. Ciao a tutti Paolo

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Ajò Dimonios

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

Posted: Fri Jun 09, 2017 1:37 pm Post subject:

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If R2C5=3

Code:

+-------------+-----------+-----------+
| 3 2 7 | 6 8 45 | 49 1 59 |
| 458 145 9 | 7 3 145 | 6 2 58 |
| 6 145 148 | 2 9 145 | 48 7 3 |
+-------------+-----------+-----------+
| 489 3 48 | 1 5 6 | 2 89 7 |
| 1 7 2 | 8 4 9 | 5 3 6 |
| 89 6 5 | 3 7 2 | 89 4 1 |
+-------------+-----------+-----------+
| 57 159 16 | 59 2 78 | 3 689 4 |
| 245 8 46 | 459 1 3 | 7 69 29 |
| 27 49 3 | 49 6 78 | 1 5 28 |
+-------------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site
8 fin x-wing( line 3 and line 6)=>-8 R2C1=>locked and single to the error=>-3R2C5

If R2C5=4

Code:

+--------------+-----------+----------------+
| 34 2 7 | 136 8 156 | 3469 1369 1359 |
| 38 15 9 | 7 4 156 | 368 2 1358 |
| 6 15 348 | 123 9 125 | 348 138 7 |
+--------------+-----------+----------------+
| 7 3 68 | 16 5 4 | 2 189 189 |
| 1 4 2 | 8 3 9 | 5 7 6 |
| 89 69 5 | 126 7 126 | 38 4 138 |
+--------------+-----------+----------------+
| 359 679 1 | 59 2 78 | 3689 3689 4 |
| 2459 8 46 | 459 1 3 | 7 69 29 |
| 2349 79 34 | 49 6 78 | 1 5 2389 |
+--------------+-----------+----------------+

Play this puzzle online at the Daily Sudoku site
3 fin swordfish( line 2, line 6, line 7) -3 R9C9

Code:

+-----------+-----------+--------------+
| 4 2 7 | 136 8 156 | 9 136 135 |
| 38 15 9 | 7 4 156 | 368 2 1358 |
| 6 15 38 | 123 9 125 | 4 138 7 |
+-----------+-----------+--------------+
| 7 3 68 | 16 5 4 | 2 189 189 |
| 1 4 2 | 8 3 9 | 5 7 6 |
| 89 69 5 | 126 7 126 | 38 4 138 |
+-----------+-----------+--------------+
| 59 67 1 | 59 2 78 | 368 368 4 |
| 259 8 46 | 459 1 3 | 7 69 29 |
| 239 79 34 | 49 6 78 | 1 5 289 |
+-----------+-----------+--------------+

Play this puzzle online at the Daily Sudoku site

If R6C1=8 or 9=> error => -4 R2C5 =>R2C5=1=>solution stte.

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Ajò Dimonios

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

Posted: Fri Jun 09, 2017 10:04 pm Post subject:

Hi everyone The solution can also be achieved by starting from one of the following hypotheses If R3C8= 3=> lclste If R4C4= 4=> lclste If R6C4= 6=> lclste If R7C3= 3=> lclste If R8C3= 1=> lclste If R8C5= 4=> lclste If R9C9= 3=> lclste Ciao a tutti Paolo

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