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VH+051121

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Tue May 11, 2021 5:22 pm    Post subject: VH+051121 Reply with quote
Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Fri May 14, 2021 12:43 pm    Post subject: Reply with quote
I enjoy doing these VH+ puzzles that immpy posts.

After basics:

Code:
+-------------+-------------+-------------+
| 8   67  57  | 4   569 2   | 1   356 359 |
| 256 1   4   | 3   569 7   | 8   256 259 |
| 256 9   3   | 168 568 15  | 57  4   257 |
+-------------+-------------+-------------+
| 7   5   6   | 2   3   8   | 4   9   1   |
| 9   4   1   | 5   7   6   | 2   38  38  |
| 3   8   2   | 19  4   19  | 57  57  6   |
+-------------+-------------+-------------+
| 56  2   9   | 678 568 4   | 3   1   578 |
| 4   3   8   | 79  1   59  | 6   257 257 |
| 1   67  57  | 68  2   3   | 9   58  4   |
+-------------+-------------+-------------+

Then I used the following forcing chain:

8r9c8=(8*-6)r9c4=r9c2-(6=5)r7c1-[r23c1=5*r1c3 -(58*=6)r7c5]-(5*6=9)r1c5-(5*9=3)r1c9-(3=8)r5c9 => r5c8 <> 8; stte.
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Fri May 14, 2021 5:12 pm    Post subject: Reply with quote
Thank again dongrave. Nice chain.

cheers...immp
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sat May 15, 2021 8:02 am    Post subject: Reply with quote
Good puzzle, I had to break this down as chains stump me a bit

First r7c4 <> 6 XYZ 568
then r3c1 <> 6 using the 6's in c24 leads to
Code:

+-----------+-----------+------------+
| 8   67 57 | 4  59  2  | 1  356 359 |
| 256 1  4  | 3  59  7  | 8  256 259 |
| 25  9  3  | 68 68  15 | 57 4   257 |
+-----------+-----------+------------+
| 7   5  6  | 2  3   8  | 4  9   1   |
| 9   4  1  | 5  7   6  | 2  38  38  |
| 3   8  2  | 19 4   19 | 57 57  6   |
+-----------+-----------+------------+
| 56  2  9  | 78 568 4  | 3  1   578 |
| 4   3  8  | 79 1   59 | 6  257 257 |
| 1   67 57 | 68 2   3  | 9  58  4   |
+-----------+-----------+------------+

Play this puzzle online at the Daily Sudoku site

Then r1c8 <> 3 as this would give a 7 in both r19c3
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