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Unfair 081620

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Sun Aug 16, 2020 6:49 pm    Post subject: Unfair 081620 Reply with quote
Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Mon Aug 17, 2020 11:56 am    Post subject: Reply with quote
Code:

+---------------+-------------+----------------+
| 9    3    1   | 7   2   6   | 458 48    45   |
| 4    7    8   | 3   5   9   | 6   12    12   |
| 56   56   2   | 8   4   1   | 7   3     9    |
+---------------+-------------+----------------+
| 358  1    345 | 46  389 7   | 2   4689  34   |
| 2    48   347 | 46  389 5   | 489 14689 1347 |
| 3678 468  9   | 1   38  2   | 48  5     347  |
+---------------+-------------+----------------+
| 1    2459 6   | 59  7   8   | 3   249   245  |
| 37   259  37  | 59  6   4   | 1   29    8    |
| 58   4589 45  | 2   1   3   | 459 7     6    |
+---------------+-------------+----------------+

I'm sure someone out there must have a better one-step solution that this one.

(2-1)r2c8=(1-6)r5c8=r5c4-(6=4)r4c4-(4=3)r4c9-(34=5)r4c3-(35=8)r4c1-(8=5)r9c1-(5=4)r9c3-(45=9)r9c7-(9=2)r8c8; contradiction => r2c8 <> 2; stte.

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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
PostPosted: Mon Aug 17, 2020 12:04 pm    Post subject: Reply with quote
Hi everyone,

Code:

+---------------+----------+----------------+
| 9    3    1   | 7  2   6 | 458 48    45   |
| 4    7    8   | 3  5   9 | 6   12    12   |
| 56   56   2   | 8  4   1 | 7   3     9    |
+---------------+----------+----------------+
| 358  1    345 | 46 389 7 | 2   4689  34   |
| 2    48   347 | 46 389 5 | 489 14689 1347 |
| 3678 468  9   | 1  38  2 | 48  5     347  |
+---------------+----------+----------------+
| 1    2459 6   | 59 7   8 | 3   249   245  |
| 37   259  37  | 59 6   4 | 1   29    8    |
| 58   4589 45  | 2  1   3 | 459 7     6    |
+---------------+----------+----------------+

Play this puzzle online at the Daily Sudoku site

WXYZ-Wing 4,6,8,9 r4c48,r56c7 and -4 in r4c9

and Naked Pairs

Ciao Gianni
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Mon Aug 17, 2020 3:03 pm    Post subject: Unfair 081620 Reply with quote
Code:

+---------------------+----------------+----------------------+
| 9       3       1   | 7     2      6 |  458    48      45   |
| 4       7       8   | 3     5      9 |  6      12      12   |
| 56      56      2   | 8     4      1 |  7      3       9    |
+---------------------+----------------+----------------------+
|d358     1      d345 |d46    389    7 |  2      4689   d34   |
| 2      c48      347 |c46   c389    5 |fb89    14689    1347 |
| 3678    468     9   | 1    b38     2 | a4-8   5        347  |
+---------------------+----------------+----------------------+
| 1       2459    6   | 59    7      8 |  3      249     245  |
| 37      259     37  | 59    6      4 |  1      29      8    |
|e58      4589   e45  | 2     1      3 | e459   7        6    |
+---------------------+----------------+----------------------+

8r6c7 - (8=9,3)r5c7,r6c5 - (93=846)r5c524 - (6=4358)r4c4931 - (8=549)r9c137 - (9=8)r5c7 => - 8r6c7; btte
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Tue Aug 18, 2020 12:11 am    Post subject: Reply with quote
Hi Clement! Isn't your starting grid missing the candidate 4 in r5c7? My English translation of your solution would be as follows: If r6c7 = 8, then r5c7 = 9 and r6c5 = 3, so row 5 columns 5, 2, and 4 = 8, 4, and 6 etc. but both Gianni's and my starting grids also include the candidate 4 in r5c7 which seems to spoil your solution. Am I overlooking something? I couldn't find a way to eliminate it from the starting grid (e.g. with LC's or any other basics). Thanks, Don.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Tue Aug 18, 2020 9:03 am    Post subject: Unfair 081620 Reply with quote
dongrave wrote:
Hi Clement! Isn't your starting grid missing the candidate 4 in r5c7? My English translation of your solution would be as follows: If r6c7 = 8, then r5c7 = 9 and r6c5 = 3, so row 5 columns 5, 2, and 4 = 8, 4, and 6 etc. but both Gianni's and my starting grids also include the candidate 4 in r5c7 which seems to spoil your solution. Am I overlooking something? I couldn't find a way to eliminate it from the starting grid (e.g. with LC's or any other basics). Thanks, Don.
Yes, you are quite right, the candidate 4 is missing in r5c7, I might have accidentally deleted it when cleaning pencil marks. The chain in my solution should be counted as invalid Embarassed
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Tue Aug 18, 2020 1:19 pm    Post subject: Unfair 081620 Reply with quote
Code:

+---------------------+----------------+----------------------+
| 9       3       1   | 7     2      6 | 458    48       45   |
| 4       7       8   | 3     5      9 | 6     f12      g12   |
| 56      56      2   | 8     4      1 | 7      3        9    |
+---------------------+----------------+----------------------+
|c358     1      c345 |c46    389    7 | 2      4689    c34   |
| 2       48      347 |d46    389    5 | 489   e14689    1347 |
| 3678    468     9   | 1     38     2 | 48     5        347  |
+---------------------+----------------+----------------------+
| 1       2459    6   | 59    7      8 | 3      249     a45-2 |
| 37      259     37  | 59    6      4 | 1      29       8    |
|b58      4589    45  | 2     1      3 |b459    7        6    |
+---------------------+----------------+----------------------+

(2-5)r7c9 = (58)r9c71 - (8=3|5|46)r4c1394 - (6)r5c4 = (6-1)r5c8 = (1-2)r2c8 = (2)r2c9 => - 2r7c9; btte
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Tue Aug 18, 2020 6:00 pm    Post subject: Reply with quote
Love those WXYZ-wings. Nice touch Gianni.
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