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Hard puzzle III

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Ajò Dimonios

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

Posted: Mon Jul 10, 2017 11:59 am Post subject: Hard puzzle III

Hi everyone

Code:

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

Play this puzzle online at the Daily Sudoku site

Ciao a tutti
Paolo

JC Van Hay

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

Posted: Mon Jul 10, 2017 3:35 pm Post subject:

[HP(34)r3c46=(4-1)r2c5=(1-5)r2c8=5r3c8]-5r3c4; stte

Ajò Dimonios

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

Posted: Mon Jul 10, 2017 5:19 pm Post subject:

Hi everyone

Code:

+--------------+-----------------+-----------------+
| 79 2579 3 | 8 125 12 | 4 6 1279 |
| 489 259 289 | 7 1245 6 | 289 1258 3 |
| 478 1 6 | 2345 9 234 | 278 2578 27 |
+--------------+-----------------+-----------------+
| 3 469 49 | 2469 2478 2478 | 5 127 1267 |
| 2 8 5 | 16 3 17 | 67 9 4 |
| 1 469 7 | 24569 245 24 | 236 23 8 |
+--------------+-----------------+-----------------+
| 789 279 289 | 23 6 2378 | 1 4 5 |
| 5 247 248 | 12 1278 9 | 23678 2378 267 |
| 6 3 1 | 24 2478 5 | 2789 278 279 |
+--------------+-----------------+-----------------+

Play this puzzle online at the Daily Sudoku site

One step solution.
[(5)R2C8-(5)R2C2=(5)R1C2-(5)R1C5 and (5-1)R2C8=(1)R1C9-(1)R1C45]=> contradiction two singles 2 in line 1 or box 2=>-5R2C8=>solution stte.
Are there other single-step solution methods?

Ciao a tutti
Paolo

Last edited by Ajò Dimonios on Mon Jul 10, 2017 5:40 pm; edited 1 time in total

Ajò Dimonios

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

Posted: Mon Jul 10, 2017 5:39 pm Post subject:

Hi everyone

Code:

Play this puzzle online at the Daily Sudoku site

Another one step solution.

[(5)R6C5-(5)R1C5 and (5)R6C5-(5)R6C4=(5)R3C4-(5)R3C8=(5-1)R2C8=(1)R1C9-(1)R1C45] ]=> contradiction two singles 2 in line 1 or box 2=>-5R6C5=>solution stte.

Ciao a tutti
Paolo

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