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VH+ 010723

 
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immpy



Joined: 06 May 2017
Posts: 571

PostPosted: Sat Jan 07, 2023 6:01 pm    Post subject: VH+ 010723 Reply with quote

Hello all, enjoy the puzzle.

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Wed Jan 11, 2023 5:50 pm    Post subject: Reply with quote

I had a tough time with this one immpy!

After basics:
Code:
+---------------+---------------+-----------------+
| 236  26   5   | 4   367  2367 | 8   9     1     |
| 7    9    248 | 5   1    28   | 3   24    6     |
| 2346 2468 1   | 9   368  2368 | 25  2457  247   |
+---------------+---------------+-----------------+
| 8    5    9   | 2   367  367  | 46  1     34    |
| 46   7    34  | 8   5    1    | 9   236   23    |
| 126  126  23  | 36  9    4    | 7   8     5     |
+---------------+---------------+-----------------+
| 9    248  248 | 367 3468 5    | 1   23467 23478 |
| 5    148  7   | 136 2    368  | 46  346   9     |
| 124  3    6   | 17  48   9    | 25  2457  2478  |
+---------------+---------------+-----------------+

Then I couldn't find a one-stepper so I ended up settling for 3 steps. The 1st assumed that r9c4 = 1 and hit a contradiction, the 2nd assumed that r2c3 <> 8 and hit a contradiction, and the 3rd assumed that r5c3 = 3 and also hit a contradiction.
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immpy



Joined: 06 May 2017
Posts: 571

PostPosted: Tue Jan 17, 2023 7:50 pm    Post subject: Reply with quote

Maybe this one was more of a VH++.

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Fri Jan 20, 2023 2:50 am    Post subject: Reply with quote

So that's it? No one else is going to post a solution for this one? If that's the case, then I guess this really was a VH++! (Ugh!)
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glesco



Joined: 12 May 2022
Posts: 36

PostPosted: Mon Jan 23, 2023 2:11 am    Post subject: Reply with quote

I used a chain of 8s anchored at r2c3 & r8c2 which removes 8s from r3c2 & r7c3. The later gives an 8 at r2c3 by virtue of column 3.

That led to a contradiction of 4s in box 7. That filled out most of the puzzle.

Used an xy-wing to complete.
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