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12-07-2023-daily-VH

 
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peter urhegyi



Joined: 26 Oct 2020
Posts: 28
PostPosted: Wed Jul 12, 2023 7:15 pm    Post subject: 12-07-2023-daily-VH Reply with quote
Code:

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



Joined: 06 Mar 2014
Posts: 568
PostPosted: Fri Jul 14, 2023 3:46 pm    Post subject: Reply with quote
Thanks for the puzzle Peter!

After basics:
Code:
+--------------+---------------+---------------+
| 7    9   6   | 15   135  13  |  2    4   8   |
| 8    2   1   | 4    6    7   |  5    3   9   |
| 3    5   4   | 28   28   9   |  7    6   1   |
+--------------+---------------+---------------+
| 156  4   3   | 7   e18   2   | d168  9   56  |
| 1569 16  7   | 18   349  34  |  1468 12  256 |
| 19   8   2   | 6   a4*9  5   | b14   7   3   |
+--------------+---------------+---------------+
| 2    16  5   | 9    7    16  |  3    8   4   |
| 14   7   9   | 3   f124  8   | c16   5  g26  |
| 146  3   8   | 125  1245 146 |  9    12  7   |
+--------------+---------------+---------------+

Since it was rated VH I first tried to solve it using just VH moves (i.e. X Wing, XY Wing, and XYZ Wing) with no luck so I ended up using the following chain instead: 4*r6c5-(4=1)r6c7-(1=6)r8c7-(16=8)r4c7-(8=1)r4c5-(14*=2)r8c5-(2=6)r8c9 contradiction (i.e. 6r8c79) => r6c5 <> 4; stte.
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peter urhegyi



Joined: 26 Oct 2020
Posts: 28
PostPosted: Sun Jul 16, 2023 7:00 am    Post subject: Re: 12-07-2023-daily-VH Reply with quote
peter urhegyi wrote:
Code:

+-------+-------+-------+
| . . 6 | . . . | 2 . . |
| . 2 . | 4 . 7 | . 3 . |
| 3 . . | . . . | . . 1 |
+-------+-------+-------+
| . 4 . | 7 . 2 | . 9 . |
| . . . | . . . | . . . |
| . 8 . | 6 . 5 | . 7 . |
+-------+-------+-------+
| 2 . . | . . . | . . 4 |
| . 7 . | 3 . 8 | . 5 . |
| . . 8 | . . . | 9 . . |
+-------+-------+-------+
Needs swordfish and several xy-wings
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