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Did I fool the Draw/Play Grade function??

 
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immpy



Joined: 06 May 2017
Posts: 239

PostPosted: Fri Dec 21, 2018 2:52 pm    Post subject: Did I fool the Draw/Play Grade function?? Reply with quote

Interesting puzzle; when I loaded it into Draw/Play and checked its' Grade it showed Very Hard...but it surely is more than a VH. Techniques beyond the X, XY, XYZ gambit are needed here, and upon asking for hints on Draw/Play it eventually reached the "Device Interface cannot explain this hint" stage fairly early; yet remained graded as VH. I leave it to the community to comment and/or explain this phenomenon.

Meanwhile, enjoy the puzzle...
Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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immpy



Joined: 06 May 2017
Posts: 239

PostPosted: Thu Jan 10, 2019 11:52 am    Post subject: Reply with quote

Here is the puzzle after basics:

Code:

+--------------+-----------------+---------+
| 4   5    1   | 2    3     7    | 9  6 8  |
| 2   8    39  | 6    459   459  | 7  1 34 |
| 379 379  6   | 49   1     8    | 34 2 5  |
+--------------+-----------------+---------+
| 8   1    49  | 7    4569  4569 | 56 3 2  |
| 39  349  2   | 459  8     4569 | 56 7 1  |
| 5   6    7   | 1    2     3    | 8  4 9  |
+--------------+-----------------+---------+
| 1   3479 349 | 3459 45679 4569 | 2  8 34 |
| 6   349  8   | 349  49    2    | 1  5 7  |
| 37  2    5   | 8    47    1    | 34 9 6  |
+--------------+-----------------+---------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
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immpy



Joined: 06 May 2017
Posts: 239

PostPosted: Thu Jan 10, 2019 12:25 pm    Post subject: Reply with quote

The puzzle CAN indeed be solved with only VH moves (X, XY, and XYZ wings). As it turned out, one would need multiple VH moves. I think I needed five steps. Helmut's website confirmed the path that one could follow.
So...it is I who have been fooled, not the Puzzle Grade function. I chose to follow more advanced techniques, but I still required multiple steps to solve.
All of that being said makes this one of, if not THE toughest VH puzzle I have experienced to date. A damn cool VH which was rated "Extreme" by my solver program.

cheers all...immp
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immpy



Joined: 06 May 2017
Posts: 239

PostPosted: Tue Jan 15, 2019 1:40 pm    Post subject: Reply with quote

I have purposely NOT posted the steps needed for this one. Didn't want to be a spoiler. But if someone would like them, I can post them.

ALL VH moves; 4 steps.....

cheers...immp
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