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very hard

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Ajò Dimonios

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

Posted: Wed Jun 14, 2017 7:19 pm Post subject: very hard

Hi everyone

Code:

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

Play this puzzle online at the Daily Sudoku site

Ciao a Tutti
Paolo

ZeroAssoluto

Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy

Posted: Thu Jun 15, 2017 2:06 pm Post subject:

Hi everyone, it seems to me that this scheme has more than one solution Ciao Gianni

Ajò Dimonios

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

Posted: Thu Jun 15, 2017 3:11 pm Post subject:

Sorry everyone

Copying I made mistakes

Code:

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

Play this puzzle online at the Daily Sudoku site

Ciao a tutti
Paolo

Ajò Dimonios

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

Posted: Fri Jun 16, 2017 1:32 pm Post subject:

Hi everyone

Code:

+--------------+--------------+-----------------+
| 1 5 37 | 6 79 4 | 2 8 379 |
| 6 479 8 | 3 2579 259 | 49 14579 1579 |
| 379 2 347 | 8 1 59 | 3469 45679 3579 |
+--------------+--------------+-----------------+
| 789 379 6 | 579 4 1 | 389 579 2 |
| 789 1479 147 | 2 59 3 | 4689 45679 5789 |
| 5 3479 2 | 79 8 6 | 1 479 379 |
+--------------+--------------+-----------------+
| 27 17 157 | 4 6 259 | 89 3 189 |
| 23 6 135 | 59 259 8 | 7 19 4 |
| 4 8 9 | 1 3 7 | 5 2 6 |
+--------------+--------------+-----------------+

Play this puzzle online at the Daily Sudoku site
4 fin x-wing (line 2, line 6) (fin 4 R2C8)=>- 4R3C8
AIC (9)R1C9=(9)R1C5-(9)R23C6=(9)R7C6-(9)R7C9=>-9R7C9.
AIC (9)R8C8=(9)R7C7-(9)R7C6=(9)R23C6-(9)R1C5=(9)R1C9-(9)R23C8=>-9 R23C8.
AIC(9)R5C5=(9)R46C4-(9)R8C4=(9-1)R8C8-=(1-8)R7C9=(8)R7C7-(8)R45C7=(8)R5C9-(9)R5C9=>-9R5C9
Discontinuous nice loop (2)R2C5-(2)R8C5=(2-3)R8C1=(3)R3C1-(3=7)R1C3-(7)R1C5=(7)R2C2-(2)R2C5=>-2R2C5

Code:

+--------------+------------+-----------------+
| 1 5 37 | 6 79 4 | 2 8 379 |
| 6 479 8 | 3 579 2 | 49 147 1579 |
| 79 2 347 | 8 1 59 | 3469 567 3579 |
+--------------+------------+-----------------+
| 789 379 6 | 579 4 1 | 389 579 2 |
| 789 1479 147 | 2 59 3 | 4689 45679 578 |
| 5 3479 2 | 79 8 6 | 1 479 379 |
+--------------+------------+-----------------+
| 2 17 157 | 4 6 59 | 89 3 18 |
| 3 6 15 | 59 2 8 | 7 19 4 |
| 4 8 9 | 1 3 7 | 5 2 6 |
+--------------+------------+-----------------+

Play this puzzle online at the Daily Sudoku site
Discontinuous nice loop (5)R2C8-(5)R45C9=(5)R5C9-(5)R5C5=(5)R2C5-(5)R2C8=>-5R2C8
X-color Green(R1C9,R2C2,R3C6,R4C1,R5C5,R6C8,R7C7,R8C4), yellow(R7C6,R8C8) =>-9R45C8
Discontinuous nice loop (9)R5C2-(9=5)R5C5-(5)R4C4=(5)R8C4-(5-1)R8C3-(1)R5C3=(1-9)R5C2=>-9R5C2
Discontinuous nice loop (7)R2C8-(7)R2C5=(7-9)R1C5)=(9-5)R5C5=(5)R4C4-(5=7)R4C8-(7)R2C8=>-7R2C8
Discontinuous nice loop (4)R2C8-(4=9)R2C7-(9=8)R7C7)-(8=1)R7C9-(1)R2C9=(1-4)R2C8 =>-4R2C8=>solution stte.

Ciao a Tutti
Paolo

Ajò Dimonios

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

Posted: Fri Jun 16, 2017 1:45 pm Post subject:

Hi everyone

Quote:

It is possible to solve the puzzle with a single move.
If R2C8≠1=>Singles that lead to error=>R2C8=1=>Solution stte.

Ciao a tutti
Paolo

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