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VH+ 122922

 
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Thu Dec 29, 2022 7:39 pm    Post subject: VH+ 122922 Reply with quote

Hello all, enjoy the puzzle.

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Fri Dec 30, 2022 10:09 am    Post subject: Reply with quote

Another great puzzle immpy!

Remove <6> from r3c2 to solve

Code:

+---------------------+----------------+-----------------+
| a18     5    b168   | 2    168   3   | 79     4    79  |
|  2      9     3468  | 47   468   78  | 5      1    36  |
| c13    x146   7     | 145  1456  9   | 2      8   d36  |
+---------------------+----------------+-----------------+
|  13579  147   13459 | 8    135   6   | 13479  379  2   |
|  1359   14    2     | 157  135   57  | 8      6    149 |
|  6      178   138   | 9    2     4   | 137    37   5   |
+---------------------+----------------+-----------------+
|  5789   3     589   | 6    458   1   | 479    2    479 |
|  1589   1268  15689 | 345  7     258 | 13469  359  149 |
|  4      1267  156   | 35   9     25  | 1367   357  8   |
+---------------------+----------------+-----------------+

Play this puzzle online at the Daily Sudoku site

Quote:
If ab is a <18> pair then c=3, d=6 and x is NOT <6>
If ab is NOT a <18> pair then b=6 and x is NOT <6>

Or you could say it doesn't matter what goes in b <168> x is never going to be <6>
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Fri Dec 30, 2022 7:52 pm    Post subject: Reply with quote

After basics:
Code:
+--------------------+----------------+---------------+
| b18     5   c168   |  2   d168  3   | 79    4   79  |
|  2      9    3468  |  47   468  78  | 5     1   36  |
| a1*3   h146  7     |  145  1456 9   | 2     8   36  |
+--------------------+----------------+---------------+
|  13579  147  13459 |  8   e135  6   | 13479 379 2   |
|  1359  g14   2     | f157 e135  57  | 8     6   149 |
|  6      178  138   |  9    2    4   | 137   37  5   |
+--------------------+----------------+---------------+
|  5789   3    589   |  6    458  1   | 479   2   479 |
|  1589   1268 15689 |  345  7    258 | 13469 359 149 |
|  4      1267 156   |  35   9    25  | 1367  357 8   |
+--------------------+----------------+---------------+

Then I used the chain 1*r3c1-(1=8)r1c1-(18=6)r1c3-(68=1)r1c5-r45c5=r5c4-(1=4)r5c2-(1*4=6)r3c2 contradiction (i.e. 6r1c3, 6r3c2) => r3c1 <> 1; stte.
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Thu Jan 05, 2023 6:24 pm    Post subject: Reply with quote

Thanks TomC, glad you are enjoying them.
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