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Daily Sudoku for 8/3/2019 - Diabolical

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Sat Mar 09, 2019 7:03 pm    Post subject: Daily Sudoku for 8/3/2019 - Diabolical Reply with quote
Code:

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

Play this puzzle online at the Daily Sudoku site
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Sat Mar 09, 2019 8:25 pm    Post subject: Reply with quote
Hi everyone,

Code:

+--------------+----------------+-------------+
| 45 568  3468 | 89    1   348  | 569 7   2   |
| 9  15   23   | 27    46  237  | 8   15  46  |
| 7  1268 2468 | 5     469 248  | 169 14  3   |
+--------------+----------------+-------------+
| 8  4    5    | 6     2   1    | 3   9   7   |
| 6  3    1    | 4     7   9    | 2   8   5   |
| 2  7    9    | 3     8   5    | 4   6   1   |
+--------------+----------------+-------------+
| 3  258  248  | 12789 459 6    | 17  124 48  |
| 45 268  7    | 128   45  28   | 16  3   9   |
| 1  9    2468 | 278   3   2478 | 567 245 468 |
+--------------+----------------+-------------+

Play this puzzle online at the Daily Sudoku site

first step
AIC in r1c1
if r1c1=5 and -5 in r12c2,r8c1
if r1c1=4 r8c1=5 r8c5=4 r2c5=6 r2c9=4 r9c9=6 r8c7=1 r7c4=1 r7c5=9 r7c2=5 and -5 in r12c2,r8c1

Code:

+------------+---------------+-------------+
| 5 68  34   | 89   1   34   | 69  7   2   |
| 9 1   23   | 27   46  237  | 8   5   46  |
| 7 268 2468 | 5    469 248  | 169 14  3   |
+------------+---------------+-------------+
| 8 4   5    | 6    2   1    | 3   9   7   |
| 6 3   1    | 4    7   9    | 2   8   5   |
| 2 7   9    | 3    8   5    | 4   6   1   |
+------------+---------------+-------------+
| 3 5   28   | 1289 49  6    | 7   124 48  |
| 4 268 7    | 128  5   28   | 16  3   9   |
| 1 9   268  | 278  3   2478 | 5   24  468 |
+------------+---------------+-------------+

Play this puzzle online at the Daily Sudoku site

XY-Chain r2c3-2-r7c3-8-r7c9-4-r2c9-6-r2c5-4-r1c6 and -3 in r1c3,r2c6

Code:

+-----------+---------------+-------------+
| 5 68  4   | 89   1   3    | 69  7   2   |
| 9 1   23  | 27   46  27   | 8   5   46  |
| 7 268 268 | 5    469 248  | 169 14  3   |
+-----------+---------------+-------------+
| 8 4   5   | 6    2   1    | 3   9   7   |
| 6 3   1   | 4    7   9    | 2   8   5   |
| 2 7   9   | 3    8   5    | 4   6   1   |
+-----------+---------------+-------------+
| 3 5   28  | 1289 49  6    | 7   124 48  |
| 4 268 7   | 128  5   28   | 16  3   9   |
| 1 9   268 | 278  3   2478 | 5   24  468 |
+-----------+---------------+-------------+

Play this puzzle online at the Daily Sudoku site

AIC in r8c2
if r8c2=6 and -6 in r13c2,r9c3
if r8c2-6 r8c7=6 r3c7=1 r3c5=9 r2c5=6 r2c9=4 r9c9=6 r3c3=6 and -6 in r13c2,r9c3

Ciao Gianni
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Sun Mar 10, 2019 2:58 pm    Post subject: Reply with quote
Hi everyone.
after basics
Code:

+--------------+----------------+-------------+
| 45 568  3468 | 89    1   348  | 569 7   2   |
| 9  15   23   | 27    46  237  | 8   15  46  |
| 7  1268 2468 | 5     469 248  | 169 14  3   |
+--------------+----------------+-------------+
| 8  4    5    | 6     2   1    | 3   9   7   |
| 6  3    1    | 4     7   9    | 2   8   5   |
| 2  7    9    | 3     8   5    | 4   6   1   |
+--------------+----------------+-------------+
| 3  258  248  | 12789 459 6    | 17  124 48  |
| 45 268  7    | 128   45  28   | 16  3   9   |
| 1  9    2468 | 278   3   2478 | 567 245 468 |
+--------------+----------------+-------------+

Play this puzzle online at the Daily Sudoku site
One step after basics
If R1C4=8=>contradiction =>R1C4=9=>solution
(8-9)R1C4=9R3C5-9R7C5=(9-1)R7C4=1R8C4-1R8C7; (8-9)R1C4=(9-6)2R3C5=6R2C5-6R2C9=6R9C9-6R8C7=>R8C7=Ø therefore the initial hypothesis R1C4 = 8 is incorrect and consequently R1C4 =9 is true.R1C4=9=>stte.
Ciao a Tutti
Paolo
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Mon Mar 11, 2019 5:18 pm    Post subject: Daily Sudoku for 8/3/2019 - Diabolical Reply with quote
Code:

+--------------------+----------------------+---------------------+
| 45    568     3468 | 89       1      38-4 |c569      7      2   |
| 9     15      23   | 27      e46     237  | 8        15    d46  |
| 7     1268    2468 | 5        469    28-4 |c169      14     3   |
+--------------------+----------------------+---------------------+
| 8     4       5    | 6        2      1    | 3        9      7   |
| 6     3       1    | 4        7      9    | 2        8      5   |
| 2     7       9    | 3        8      5    | 4        6      1   |
+--------------------+----------------------+---------------------+
| 3     258     248  | 12789    59-4   6    | 17       124    48  |
| 45    268     7    | a128     5-4   a28   |b16       3      9   |
| 1     9       2468 | a278     3     a2478 | 567      245    468 |
+--------------------+----------------------+---------------------+

(4=2781)b8p4679 - (1=6)r8c7 - r13c7 = r2c9 - (6=4)r2c5 => - 4r13c6,r78c5; stte
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