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VH+ 100321

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Sun Oct 03, 2021 4:38 pm    Post subject: VH+ 100321 Reply with quote
Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp

Last edited by immpy on Sun Oct 03, 2021 4:40 pm; edited 1 time in total
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Sun Oct 03, 2021 4:39 pm    Post subject: Reply with quote
Enjoy.
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Mon Oct 04, 2021 6:56 pm    Post subject: Reply with quote
After basics:
Code:

+----------------+--------------+---------------+
| 5   128  1278  | 478 9    6   | 1278 3    248 |
| 4   9    278   | 3   27   1   | 278  6    5   |
| 3   1268 12678 | 5   247  278 | 9    1278 248 |
+----------------+--------------+---------------+
| 9   5    68    | 2   367  37  | 4    78   1   |
| 2   7    4     | 1   8    9   | 3    5    6   |
| 1   68   3     | 47  467  5   | 278  278  9   |
+----------------+--------------+---------------+
| 6   12   9     | 78  127  278 | 5    4    3   |
| 7   4    5     | 9   123  23  | 6    128  28  |
| 8   3    12    | 6   5    4   | 12   9    7   |
+----------------+--------------+---------------+

Then I used the following chain: (2*-1)r9c7=[r9c3-(1=2@)r7c2 =r1c7]-(12@=8)r1c2-(8=2|7)r2c35-(27=8)r2c7-(2*8=7)r6c7-(7=8)r4c8-r4c3=r6c2 contradiction (i.e. 8r16c2) => r9c7 <> 2; stte.

I just noticed though that the chain would be a little cleaner if I had started with the assumption that r7c2 was a 2!
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Fri Oct 08, 2021 3:20 am    Post subject: Reply with quote
Well done dongrave. I see what you mean about starting with r7c2(1=2)!

Can you bring me up to speed with what @ signifies in your Eureka ?
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