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VH+ 122922

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immpy

Joined: 06 May 2017
Posts: 574

Posted: Thu Dec 29, 2022 7:39 pm Post subject: VH+ 122922

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

TomC

Joined: 30 Oct 2020
Posts: 359
Location: Wales

Posted: Fri Dec 30, 2022 10:09 am Post subject:

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>

dongrave

Joined: 06 Mar 2014
Posts: 572

Posted: Fri Dec 30, 2022 7:52 pm Post subject:

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.

immpy

Joined: 06 May 2017
Posts: 574

Posted: Thu Jan 05, 2023 6:24 pm Post subject:

Thanks TomC, glad you are enjoying them.

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