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Extreme 120520

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immpy

Joined: 06 May 2017
Posts: 571

Posted: Sat Dec 05, 2020 6:18 pm Post subject: Extreme 120520

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

dongrave

Joined: 06 Mar 2014
Posts: 568

Posted: Sun Dec 06, 2020 8:00 pm Post subject:

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.

Clement

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

Posted: Mon Dec 07, 2020 8:30 pm Post subject: Extreme 120520

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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