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VH++ 122123

 
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Thu Dec 21, 2023 7:39 pm    Post subject: VH++ 122123 Reply with quote

Happy Holidays to all! Enjoy the puzzle.

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 564

PostPosted: Sun Dec 24, 2023 4:10 pm    Post subject: Reply with quote

Thanks for the puzzle again immp!

After basics:
Code:
+------------------+-----------------+------------------+
|  7     3    5    |  9    4     8   |  2      6   1    |
|  148   2   p468  |  136 o567  i17* |  3478   9  n4578 |
|  1489 a68*  4689 |  136  567   2   |  3478  b38  4578 |
+------------------+-----------------+------------------+
|  3     678  2    |  5    6789  4   |  789    1   789  |
| f48    9    1    |  2   g78    3   |  6      5  e4*78 |
|  5     678 q468  | r16   6789 h17  | d34789 c38  2    |
+------------------+-----------------+------------------+
|  2     4    3    |  8    1     9   |  5      7   6    |
| j89    5    7    |  4    3     6   |  1      2  m89   |
|  6     1   k8@9  |  7    2     5   | L89     4   3    |
+------------------+-----------------+------------------+

Then I used the following ridiculously long chain (using pencil and paper of course!)

8*r3c2-(8=3)r3c8-r6c8=(3-4)r6c7=4*r5c9-(4=8)r5c1-[(8=7)r5c5-(7=1)r6c6-(1=7*)r2c6 -r8c1]=8@r9c3-r9c7=r8c9-(4*7*8=5)r2c9-(57*=6)r2c5-(68*=4)r2c3-(48@=6)r6c3-(6=1)r6c4 contradiction (i.e. 1r6c46) => r3c2 != 8; stte.
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glesco



Joined: 12 May 2022
Posts: 35

PostPosted: Mon Dec 25, 2023 11:18 pm    Post subject: Reply with quote

I found a finned x-wing that eliminated 8 from r3c12. Basic steps thereafter. Hope I didn't make a mistake!
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