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sett.sudoku 12082017

 
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Ajò Dimonios



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

PostPosted: Mon Aug 14, 2017 9:01 am    Post subject: sett.sudoku 12082017 Reply with quote

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
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Ajò Dimonios



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

PostPosted: Mon Aug 14, 2017 11:13 am    Post subject: Reply with quote

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
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JC Van Hay



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

PostPosted: Mon Aug 14, 2017 12:15 pm    Post subject: Reply with quote

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
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Tue Aug 15, 2017 4:26 pm    Post subject: sett.sudoku 12082017 Reply with quote

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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