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sett.sudoku 12082017

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Ajò Dimonios

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

Posted: Mon Aug 14, 2017 9:01 am Post subject: sett.sudoku 12082017

Hi everyone

Code:

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

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: Mon Aug 14, 2017 11:13 am Post subject:

Hi everyone

Code:

+----------------+-------------+-------------+
| 2 6 7 | 5 38 9 | 4 38 1 |
| 3 5 189 | 4 7 18 | 2 6 89 |
| 4 189 189 | 6 2 138 | 39 57 57 |
+----------------+-------------+-------------+
| 6 3 1458 | 2 9 458 | 57 157 457 |
| 15 149 2 | 7 34 6 | 8 135 459 |
| 578 4789 4589 | 38 1 3458 | 39 2 6 |
+----------------+-------------+-------------+
| 178 1478 13468 | 9 5 348 | 67 78 2 |
| 578 478 4568 | 1 468 2 | 567 9 3 |
| 9 2 3568 | 38 368 7 | 1 4 58 |
+----------------+-------------+-------------+

Play this puzzle online at the Daily Sudoku site

My solution with one step after basics.

[(9)R2C3-(9=8)R2C9-(8)R1C8=(8)R1C5-(8)R23C6; (9)R2C3-(9=8)R2C9-(8)R9C9=(8)R7C8-(8)R7C6=(8)R46C6-(8)R6C4;
(9)R2C3-(9=8)R2C9-(8=3)R1C8-(3)R5C8=(3)R5C5-(3)R6C4]=>contradiction R6C4=Ø=>-9R2C3=>solution stte.

Other solutions with one step R1C8 ≠ 3 or R2C9 ≠ 8
Similar solutions with the same proof R1C8 ≠ 3 or R2C9 ≠ 8. This is because R2C3 = 9 is biunivoca with R1C8 = 3 and R2C9 = 8.

Ciao a Tutti
Paolo

JC Van Hay

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

Posted: Mon Aug 14, 2017 12:15 pm Post subject:

SSTS to the end : Basics : 11 singles; X-Wing(3R15) -> -{3r9c5, 3r3c8}; Grouped Kite(8R1C9) -> -{8r9c5}; r9c5=6 XY-Wing(348)r58c5,r6c4 -> -{8r9c4}; stte

Clement

Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

Posted: Tue Aug 15, 2017 4:26 pm Post subject: sett.sudoku 12082017

Code:

+----------------------+--------------------+------------------------+
| 2 6 7 | 5 b38 9 | 4 aA38 1 |
| 3 5 189 | 4 7 18 | 2 6 89 |
| 4 189 189 | 6 2 138 | 3579 3578 5789 |
+----------------------+--------------------+------------------------+
| 6 3 1458 | 2 9 458 | 57 157 457 |
| 15 149 2 | 7 C34 6 | 8 B135 459 |
| 578 4789 4589 |D38 1 3458 | 3579 2 6 |
+----------------------+--------------------+------------------------+
| 178 1478 13468 | 9 5 F348 | 67 7-8 2 |
| 578 478 4568 | 1 c468 2 | 567 9 3 |
| 9 2 3568 |E38 c368 7 | 1 4 58 |
+----------------------+--------------------+------------------------+

A net
(8=3)r1c8 - (3=8)r1c5 - (8)r89c5____________________
....................\........................................... .................. = (8)r7c6 => - 8 r7c8; stte
..................-(3)r5c8 = (3)r5c5 - (3=8)r6c4 - (8)r9c4___/

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