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VH+ 062717

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immpy

Joined: 06 May 2017
Posts: 571

Posted: Tue Jun 27, 2017 2:37 pm Post subject: VH+ 062717

This one was interesting. Maybe you will think so too.
Enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

Ajò Dimonios

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

Posted: Wed Jun 28, 2017 10:44 am Post subject:

Hi Immpy

My solution

Code:

+----------------+-------------+-------------+
| 3 46 456 | 2 1 8 | 69 7 569 |
| 7 26 9 | 5 36 4 | 1 38 268 |
| 1 8 256 | 369 369 7 | 236 4 256 |
+----------------+-------------+-------------+
| 4568 246 7 | 1 249 69 | 269 589 3 |
| 456 12346 246 | 349 8 369 | 7 159 269 |
| 9 1236 268 | 37 237 5 | 4 18 268 |
+----------------+-------------+-------------+
| 2 7 1 | 39 5 39 | 8 6 4 |
| 46 9 3 | 8 46 1 | 5 2 7 |
| 468 5 468 | 467 467 2 | 39 39 1 |
+----------------+-------------+-------------+

Play this puzzle online at the Daily Sudoku site
Forcing chains [(6)R2C2-(6=4)R1C2 and (6-2)R2C2=(2)R2C9-(2)R5C9=(2)R5C23-(2)R4C2;(6)R2C2-(6)R4C2]=(4)R4C2=>contradiction two 4 in column 2=>-6R2C2.
4 fin swordfish (column 2, column 3, column 4, fin 4 R4C2)=>-4R5C1
6 fin swordfish (line 2, line 6, line 8, fin 6 R6C3)=>-6R45C1
Forcing chains [(4)R9C4-(4)R5C4=(4)R5C3-(4)R4C2 and (4-6)R9C4=(6)R3C4-(6)R2C5=(6)R2C9-(6)R56C9=(6)R4C7-(6)R4C2] =>contradiction R4C2=Ø=>-4R9C4=>stte.

Ciao a tutti
Paolo

Ajò Dimonios

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

Posted: Wed Jun 28, 2017 4:44 pm Post subject:

Sorry, I replace the previous message with the following. I found a typing error on the first forcing chain.

Code:

+--------------+-------------+-------------+
| 3 46 456 | 2 1 8 | 69 7 569 |
| 7 26 9 | 5 36 4 | 1 38 268 |
| 1 8 256 | 369 369 7 | 236 4 256 |
+--------------+-------------+-------------+
| 4568 246 7 | 1 249 69 | 269 589 3 |
| 456 13 246 | 349 8 369 | 7 159 269 |
| 9 13 268 | 37 237 5 | 4 18 268 |
+--------------+-------------+-------------+
| 2 7 1 | 39 5 39 | 8 6 4 |
| 46 9 3 | 8 46 1 | 5 2 7 |
| 468 5 468 | 467 467 2 | 39 39 1 |
+--------------+-------------+-------------+

Play this puzzle online at the Daily Sudoku site
Forcing chains (6)R2C2-(6=4)R1C2;[ (6-2)R2C2=(2)R2C9-(2)R56C9=(2)R4C7-(2)R4C2 and (6)R2C2-(6)R4C2]=(4)R4C2=>contradiction two 4 in column 2=>-6R2C2.
4 fin swordfish (column 2, column 3, column 4, fin 4 R4C2)=>-4R5C1
6 fin swordfish (line 2, line 6, line 8, fin 6 R6C3)=>-6R45C1
Forcing chains [(4)R9C4-(4)R5C4=(4)R5C3-(4)R4C2 and (4-6)R9C4=(6)R3C4-(6)R2C5=(6)R2C9-(6)R56C9=(6)R4C7-(6)R4C2] =>R4C2=Ø=>-4R9C4=>stte.

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