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Daily Sudoku for 17/3/2019 - Extreme

 
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Clement



Joined: 24 Apr 2006
Posts: 978
Location: Dar es Salaam Tanzania

PostPosted: Mon Mar 18, 2019 9:14 am    Post subject: Daily Sudoku for 17/3/2019 - Extreme Reply with quote

Code:

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

Play this puzzle online at the Daily Sudoku site
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 394
Location: Rimini, Italy

PostPosted: Mon Mar 18, 2019 3:36 pm    Post subject: Reply with quote

Hi everyone,

Code:

+-------------+---------------+------------------+
| 357 6  4    | 1     59 39   | 3578  2     589  |
| 357 12 3579 | 4     8  2369 | 1357  35679 1569 |
| 8   12 359  | 2569  7  2369 | 135   3569  4    |
+-------------+---------------+------------------+
| 346 5  2    | 68    1  48   | 9     368   7    |
| 346 9  36   | 25678 25 478  | 2358  1     2568 |
| 1   7  8    | 2569  3  269  | 4     56    256  |
+-------------+---------------+------------------+
| 9   4  157  | 278   6  78   | 12578 578   3    |
| 267 8  167  | 3     4  5    | 127   79    129  |
| 257 3  57   | 2789  29 1    | 6     4     258  |
+-------------+---------------+------------------+

Play this puzzle online at the Daily Sudoku site

Finned X-Wing with number 8 in r47c68 +r5c6 and -8 in r4c4

Code:

+-------------+--------------+------------------+
| 357 6  4    | 1    59 39   | 3578  2     589  |
| 357 12 3579 | 4    8  2369 | 1357  35679 1569 |
| 8   12 359  | 259  7  2369 | 135   3569  4    |
+-------------+--------------+------------------+
| 34  5  2    | 6    1  48   | 9     38    7    |
| 346 9  36   | 78   25 478  | 2358  1     258  |
| 1   7  8    | 259  3  29   | 4     56    256  |
+-------------+--------------+------------------+
| 9   4  157  | 278  6  78   | 12578 578   3    |
| 267 8  167  | 3    4  5    | 127   79    129  |
| 257 3  57   | 2789 29 1    | 6     4     258  |
+-------------+--------------+------------------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 2,5,9 in r15c5,r6c6 and -9 in r123c6

Code:

+-------------+-------------+------------------+
| 57  6  4    | 1    59 3   | 578   2     589  |
| 357 12 3579 | 4    8  26  | 1357  35679 1569 |
| 8   12 359  | 59   7  26  | 135   3569  4    |
+-------------+-------------+------------------+
| 34  5  2    | 6    1  48  | 9     38    7    |
| 346 9  36   | 78   25 478 | 2358  1     258  |
| 1   7  8    | 25   3  9   | 4     56    256  |
+-------------+-------------+------------------+
| 9   4  157  | 278  6  78  | 12578 578   3    |
| 267 8  167  | 3    4  5   | 127   79    129  |
| 257 3  57   | 2789 29 1   | 6     4     258  |
+-------------+-------------+------------------+

Play this puzzle online at the Daily Sudoku site


AIC in r6c4
if r6c4=5 r5c5=2 and -2 in r6c4,r5c79
if r6c4=2 r3c4=5 r9c4=9 r9c9=8r4c8=8 r4c1=3 r5c1=4 r8c1=6 r9c1=2 r5c5=2 and -2 in r64c,r5c79

Ciao Gianni
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Clement



Joined: 24 Apr 2006
Posts: 978
Location: Dar es Salaam Tanzania

PostPosted: Tue Mar 19, 2019 2:25 pm    Post subject: Daily Sudoku for 17/3/2019 - Extreme Reply with quote

Code:

+-------------------+----------------------+------------------------+
| 357    6     4    | 1        59    39    | 3578     2        589  |
| 357    12    3579 | 4        8     2369  | 1357     35679    1569 |
| 8      12    359  | 2569     7     2369  | 135      3569     4    |
+-------------------+----------------------+------------------------+
| 346    5     2    | 68       1     468   | 9        368      7    |
| 346    9     36   | 25678   a25    24678 | 358-2    1        2568 |
| 1      7     8    | 2569     3     269   | 4        56       256  |
+-------------------+----------------------+------------------------+
| 9      4     157  |c278      6    c278   |d12578    578      3    |
| 267    8     167  | 3        4     5     | 127      79       129  |
| 257    3     57   | 2789    b29    1     | 6        4        258  |
+-------------------+----------------------+------------------------+

Grouped Kite on 2 in Box8
(2)r5c5 = r9c5 - r7c45 = r7c7 => - 2r5c7

Code:

+-------------------+----------------------+------------------------+
| 357    6     4    | 1        59    39    | 3578     2        589  |
| 357    12    3579 | 4        8     2369  | 1357     35679    1569 |
| 8      12    359  | 2569     7     2369  | 135      3569     4    |
+-------------------+----------------------+------------------------+
|D346    5     2    | 68       1     468   | 9       C368      7    |
| 346    9    E36   | 25678    25    24678 | 358      1        2568 |
| 1      7     8    | 2569     3     269   | 4        56       256  |
+-------------------+----------------------+------------------------+
| 9      4    c157  | 278      6     278   | 12578   B578      3    |
| 267    8    d17-6 | 3        4     5     | 127      79       19   |
|b257   3     b57   | 2789     29    1     | 6        4      a[58]  |
+-------------------+----------------------+------------------------+

Kraken Cell [58]r9c9
(5)r9c9 - r9c13 = (5-1)r7c3 = (1-6)r8c3
(8)r9c9 - r7c8 = (8-3)r4c8 = r4c1 - (3=6)r5c3 => - 6r8c3; stte
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Ajò Dimonios



Joined: 01 May 2017
Posts: 338
Location: Sassari Italy

PostPosted: Wed Mar 20, 2019 11:53 am    Post subject: Reply with quote

Hi everyone.
Code:

+-------------+---------------+------------------+
| 357 6  4    | 1     59 39   | 3578  2     589  |
| 357 12 3579 | 4     8  2369 | 1357  35679 1569 |
| 8   12 359  | 2569  7  2369 | 135   3569  4    |
+-------------+---------------+------------------+
| 346 5  2    | 68    1  48   | 9     368   7    |
| 346 9  36   | 25678 25 478  | 2358  1     2568 |
| 1   7  8    | 2569  3  269  | 4     56    256  |
+-------------+---------------+------------------+
| 9   4  157  | 278   6  78   | 12578 578   3    |
| 267 8  167  | 3     4  5    | 127   79    129  |
| 257 3  57   | 2789  29 1    | 6     4     258  |
+-------------+---------------+------------------+

Play this puzzle online at the Daily Sudoku site
One step after basics
If R5C3=3=>contradiction =>-3R5C3=>R5C3=6=> stte
This is the situation that is created if R5C3 = 3. The contradiction is evident, R5C5=Ø.
Code:

+------------+-----------+---------------+
| 37  6  4   | 1  5 39   | 378 2    89   |
| 357 12 579 | 4  8 2369 | 137 5679 1569 |
| 8   12 59  | 9  7 2369 | 13  569  4    |
+------------+-----------+---------------+
| 4   5  2   | 6  1 8    | 9   3    7    |
| 6   9  3   | 7  . 4    | 2   1    58   |
| 1   7  8   | 59 3 29   | 4   56   56   |
+------------+-----------+---------------+
| 9   4  1   | 2  6 7    | 5   8    3    |
| 2   8  6   | 3  4 5    | 17  79   19   |
| 57  3  57  | 8  9 1    | 6   4    2    |
+------------+-----------+---------------+

Play this puzzle online at the Daily Sudoku site
Ciao a Tutti
Paolo
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Clement



Joined: 24 Apr 2006
Posts: 978
Location: Dar es Salaam Tanzania

PostPosted: Wed Mar 20, 2019 1:27 pm    Post subject: Reply with quote

Ajò Dimonios wrote:
Hi everyone.
Code:

+-------------+---------------+------------------+
| 357 6  4    | 1     59 39   | 3578  2     589  |
| 357 12 3579 | 4     8  2369 | 1357  35679 1569 |
| 8   12 359  | 2569  7  2369 | 135   3569  4    |
+-------------+---------------+------------------+
| 346 5  2    | 68    1  48   | 9     368   7    |
| 346 9  36   | 25678 25 478  | 2358  1     2568 |
| 1   7  8    | 2569  3  269  | 4     56    256  |
+-------------+---------------+------------------+
| 9   4  157  | 278   6  78   | 12578 578   3    |
| 267 8  167  | 3     4  5    | 127   79    129  |
| 257 3  57   | 2789  29 1    | 6     4     258  |
+-------------+---------------+------------------+

Play this puzzle online at the Daily Sudoku site
One step after basics
If R5C3=3=>contradiction =>-3R5C3=>R5C3=6=> stte
This is the situation that is created if R5C3 = 3. The contradiction is evident, R5C5=Ø.
Code:

+------------+-----------+---------------+
| 37  6  4   | 1  5 39   | 378 2    89   |
| 357 12 579 | 4  8 2369 | 137 5679 1569 |
| 8   12 59  | 9  7 2369 | 13  569  4    |
+------------+-----------+---------------+
| 4   5  2   | 6  1 8    | 9   3    7    |
| 6   9  3   | 7  . 4    | 2   1    58   |
| 1   7  8   | 59 3 29   | 4   56   56   |
+------------+-----------+---------------+
| 9   4  1   | 2  6 7    | 5   8    3    |
| 2   8  6   | 3  4 5    | 17  79   19   |
| 57  3  57  | 8  9 1    | 6   4    2    |
+------------+-----------+---------------+

Play this puzzle online at the Daily Sudoku site
Ciao a Tutti
Paolo
Show the path(steps) which lead to the contradiction.
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Ajò Dimonios



Joined: 01 May 2017
Posts: 338
Location: Sassari Italy

PostPosted: Wed Mar 20, 2019 9:38 pm    Post subject: Reply with quote

Hi Clement.

Clement wrote:

Code:
Show the path(steps) which lead to the contradiction.


I simply used the Robert Mauriès ”Technique des pistes en sudoku”
see https://www.assistant-sudoku.com/#A. In practice I used only the basic technique in an initial scheme in which R5C3 = 3 is added. In practice, a network of interconnected interwoven logical links is created in this way, leading directly to one or more contradictions. R5C3 = 3 => R8C3 = 6; R4C8 = 3 => R7C3 = 1; R9C4 = 8; R7C8 = 8 R4C6 = 8; R7C6 = 7; R4C4 = 6; => R5C1 = 6; R5C4 = 7; R9C5 = 9; R7C7 = 5; R9C9 = 2 R8C1 = 2; R7C4 = 2; R5C6 = 4; R4C1 = 4; R1C5 = 5; R5C7 = 2 => contradiction R5C5 = Ø.

Ciao a Tutti
Paolo
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