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Extreme 120520

 
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Sat Dec 05, 2020 6:18 pm    Post subject: Extreme 120520 Reply with quote

Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Dec 06, 2020 8:00 pm    Post subject: Reply with quote

Code:
+--------------+----------------+-----------------+
| 8   4   236  | 7    156 2356  | 126  9     23   |
| 26  1   9    | 268  4   2368  | 7    2368  5    |
| 5   267 2367 | 1268 168 9     | 1268 12368 4    |
+--------------+----------------+-----------------+
| 236 26  4    | 9    58  58    | 236  7     1    |
| 7   5   8    | 26   3   1     | 4    26    9    |
| 236 9   1    | 4    67  267   | 236  5     8    |
+--------------+----------------+-----------------+
| 1   267 2567 | 568  9   4     | 258  238   237  |
| 4   3   57   | 158  2   78    | 9    18    6    |
| 9   8   2567 | 3    167 67    | 125  4     27   |
+--------------+----------------+-----------------+

8r8c6 - (8=1)r8c8 - (18=5)r8c4 - (58=6)r7c4 - (6=2)r5c4 - [(2=6)r5c8-(6=2*|3)r46c7 -(26=8)r2c4] - (268=1)r3c4 - (18=6)r3c5 - (12*6=8)r3c7 - (2*8=5)r7c7 - (2*5=1)r9c7 contradiction (i.e. 1r8c8, 1r9c7) => r8c6 <> 8; stte.
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Clement



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

PostPosted: Mon Dec 07, 2020 8:30 pm    Post subject: Extreme 120520 Reply with quote

Code:

+------------------+---------------------+---------------------+
| 8     4     236  | 7      g156   f2356 | h126    9       23  |
| 26    1     9    | 268     4      2368 | 7      b2368    5   |
| 5     267   2367 | 1268   d168    9    | c1268  b2368-1  4   |
+------------------+---------------------+---------------------+
| 236   26    4    | 9      e58    e58   | 236     7       1   |
| 7     5     8    | 26      3      1    | 4       26      9   |
| 236   9     1    | 4       67     267  | 236     5       8   |
+------------------+---------------------+---------------------+
| 1     267   2567 | 568    9       4    | 258     238     237 |
| 4     3     57   | 158    2       78   | 9      a18      6   |
| 9     8     2567 | 3      167     67   | 25-1    4       27  |
+------------------+---------------------+---------------------+

Step 1: (1=8)r8c8 - r23c8 = r3c7 - r3c5 = (85)r4c56 - (5)r1c6 = (5-1)r1c5 = (1)r1c7 => - 1r9c7, r3c8
Code:

+--------------------+-----------------+---------------------+
| 8      4      236  | 7     56    235 | 1      9        23  |
| 26     1      9    | 28    4     238 | 7     e2368     5   |
| 5      267    2367 | 1    c68    9   |d268   d2368     4   |
+--------------------+-----------------+---------------------+
| 236    26     4    | 9    b58   a58  | 236    7        1   |
| 7      5      8    |g26    3     1   | 4     f26       9   |
| 236    9      1    | 4     7     26  | 236    5        8   |
+--------------------+-----------------+---------------------+
| 1      267    2567 |g56     9     4   | 258    238     237 |
| 4      3      57   |g58     2     7-8 | 9      1       6   |
| 9      8      2567 | 3      1     67  | 25     4       27  |
+--------------------+------------------+--------------------+

Step 2: (8)r4c6 = r4c5 - (8=6)r3c5 - r3c78 = r2c8 - (6=2)r5c8 - (2=658)r578c4 => - 8r8c6; stte
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