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| jido
| | Joined: 15 Aug 2007 | | Posts: 17 | | : | |
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 Posted: Mon Aug 27, 2007 6:06 pm Post subject: Puzzles from random generator |
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I still did not understand what makes a puzzle interesting to solve (what are the fish names for anyway?) please be patient.
How is that one for example?
| Code: | 8 . 2|. . 4|. 5 .
. . .|. . .|. . .
7 4 3|. 5 2|. . 6
-----+-----+-----
4 . 1|. . 5|6 7 .
3 . .|. . 6|. 1 .
. . 5|2 . .|9 4 .
-----+-----+-----
. . .|3 . 1|. 6 .
9 . .|5 . .|. . 4
2 3 .|4 . .|. . 5 |
Or this?
| Code: | 5 . 2|9 1 8|. . .
9 . 7|. . .|2 . .
. 3 .|7 . .|. 8 .
-----+-----+-----
8 . 3|. 9 .|. . .
. . 1|. . .|8 . .
. 9 .|. . 1|5 . 6
-----+-----+-----
. 1 .|. 4 .|. 7 .
3 . 8|. 7 .|1 4 .
. . .|. 3 2|6 . . |
Warning: sudokusolver reports 2 solutions for this one
Is that a No-No? |
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| jido
| | Joined: 15 Aug 2007 | | Posts: 17 | | : | |
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| Posted: Tue Aug 28, 2007 7:05 am Post subject: |
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One more. Good luck!
| Code: | 5 8 .|. . .|3 . .
. . .|7 . .|. . .
. . 7|. 3 4|. 5 .
-----+-----+-----
. . .|5 7 .|9 . .
. 5 6|. . .|. . .
. . .|9 . .|. . 2
-----+-----+-----
7 . .|. 8 .|. . .
. 3 .|2 . 5|. 4 .
. 2 .|3 . .|. 8 . |
PS: I think I found answers to some of my questions here. To the newcomers to these forums, I recommend reading all the stickies in all the forums-- even if the forum does not seem to be about something you are interested in. There is very useful information there. |
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| jido
| | Joined: 15 Aug 2007 | | Posts: 17 | | : | |
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| Posted: Tue Aug 28, 2007 11:51 am Post subject: |
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This one seems to have a little challenge in it. Let me know.
| Code: | 4 1 .|. . .|8 6 .
. . .|. . .|. . .
. 9 .|6 . 2|. . .
-----+-----+-----
. . 4|. . .|3 . 1
. . .|4 . 5|. 8 .
. . 2|. 6 .|. . .
-----+-----+-----
. . .|. . 8|2. .
9 2 .|1 . .|6 . .
. . 8|. . .|. 5 3 |
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| daj95376
| | Joined: 05 Feb 2006 | | Posts: 349 | | : | |
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| Posted: Tue Aug 28, 2007 12:08 pm Post subject: |
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Your 2nd and 3rd puzzles have multiple solutions. They are not considered valid Sudoku puzzles. However, that hasn't prevented people from publishing books/newspapers with such puzzles and getting paid for it.
On the 1st and 4th puzzles, difficulty is subjective. For a manual solver using pencil and paper, they may be considered difficult. For computer solvers, they almost certainly have a low difficulty rating. |
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| jido
| | Joined: 15 Aug 2007 | | Posts: 17 | | : | |
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| Posted: Tue Aug 28, 2007 5:21 pm Post subject: |
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| daj95376 wrote: | Your 2nd and 3rd puzzles have multiple solutions. They are not considered valid Sudoku puzzles. However, that hasn't prevented people from publishing books/newspapers with such puzzles and getting paid for it.
On the 1st and 4th puzzles, difficulty is subjective. For a manual solver using pencil and paper, they may be considered difficult. For computer solvers, they almost certainly have a low difficulty rating. |
You are right about the 3rd puzzle, I probably did a mistake copying it 
Does this forum interest more computer solvers or manual solvers? |
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| daj95376
| | Joined: 05 Feb 2006 | | Posts: 349 | | : | |
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| Posted: Tue Aug 28, 2007 5:26 pm Post subject: |
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| It's called the Programmers Forum. Take a clue from that! However, there's always an exception to every rule ... and that's why there's a Puzzles sub-forum (that isn't used much anymore). |
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| wapati
| | Joined: 12 Jun 2007 | | Posts: 622 | | : | | Location: Canada |
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| Posted: Tue Aug 28, 2007 7:38 pm Post subject: Re: Puzzles from random generator |
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| jido wrote: | I still did not understand what makes a puzzle interesting to solve ?
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Your initial post would take volumes to answer, there was no obvious question.
I will answer this as if you had asked:
"What makes a puzzle a "sudoku" and of interest?"
Here I would say, that is 2 questions.
A sudoku puzzle is a grid, 9X9, with enough numbers as givens that
it can be filled in in only one way, and that way has every row and every
column and every box having the digits 1-9 exactly once.
Most would expect that the "givens" display symmetry, some even insist on 180 degree symmetry.
Second part:
Again two parts. <sigh>
Human pencil type solvers only want puzzles they can solve.
Given the range of abilities in human solvers, you cannot please all.
Most would expect that you indicate a rating for the puzzle so that they
won't waste their time on one too hard or easy.
Others want to analyze (with computers I hope!) puzzles to look for odd patterns/features/constraints. You can't please them all either. |
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| wapati
| | Joined: 12 Jun 2007 | | Posts: 622 | | : | | Location: Canada |
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| Posted: Tue Aug 28, 2007 8:03 pm Post subject: Re: Puzzles from random generator |
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| jido wrote: | | (what are the fish names for anyway?) |
There are three main ways to approach solving sudokus.
Patterns. (fish and stuff.)
Colors. (generally covers fish.)
Chains. Most powerful, may not be quickest for human solvers.
Fish names are used to distinguish patterns.
A bit of humor is that the first "fish", the swordfish, was named for
an airplane, not seafood.
Most of us appreciate the humor and perpetuate it.
| jido wrote: |
Warning: sudokusolver reports 2 solutions for this one
Is that a No-No? |
A valid puzzle must have only one solution. |
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