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Daily Sudoku for 17/3/2019 - Extreme

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Clement

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

Posted: Mon Mar 18, 2019 9:14 am Post subject: Daily Sudoku for 17/3/2019 - Extreme

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

ZeroAssoluto

Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy

Posted: Mon Mar 18, 2019 3:36 pm Post subject:

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

Clement

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

Posted: Tue Mar 19, 2019 2:25 pm Post subject: Daily Sudoku for 17/3/2019 - Extreme

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

Ajò Dimonios

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

Posted: Wed Mar 20, 2019 11:53 am Post subject:

Hi everyone.

Code:

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

Clement

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

Posted: Wed Mar 20, 2019 1:27 pm Post subject:

Ajò Dimonios wrote:

Hi everyone.

Code:

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

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

Ajò Dimonios

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

Posted: Wed Mar 20, 2019 9:38 pm Post subject:

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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