What is the hardest sudoku at from 17s to 40s

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What is the hardest sudoku at from 17s to 40s

Postby Eioru » Thu Aug 17, 2006 3:26 am

Now, I'm finding the hardest sudoku at different conditions.
for exemple,
"The hardest sudokus" says these two:

(1)..1..2..3.2..4..1.5..6..........7..1.3..8..2.4..5..6....5..9..2.7.....8.3.....9..
(2)..1.....2.3..4....5..6..3....7..8..1.6..1..3.1..9..8....5..9..4.8..5..7.2..1..9..

(1) is the hardest sudoku at 23's (9.9)
(2) is the hardest sudoku at 25's (9.9)

:?:
so, what is the hardest sudoku at 17's, 18's, ... , 39's, 40's?
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Postby udosuk » Thu Aug 17, 2006 8:19 am

Ocean just discovered this 21-clue puzzle with a rating of 10.0:

.....1..2.1..2..3.4..5.......4.....6.7..3..1.8.....9..5....8.......1..7...64..5..

Many would agree this has a great chance to be THE hardest sudoku for now...
udosuk
 
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re: Ocean's tough puzzle (Explainer rating from 9.4 to 10.0)

Postby Pat » Thu Aug 17, 2006 9:18 am

udosuk wrote:Ocean just discovered this 21-clue puzzle with a rating of 10.0:

.....1..2.1..2..3.4..5.......4.....6.7..3..1.8.....9..5....8.......1..7...64..5..

Many would agree this has a great chance to be THE hardest sudoku for now...

thanks, udosuk,
and here's the link:
http://forum.enjoysudoku.com/viewtopic.php?p=33382#p33382
User avatar
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Sorry I don't understand

Postby Papy » Thu Aug 17, 2006 3:53 pm

Hi every one
I'm new on the forum and also French so I don't well understand your messages

(1) is the hardest sudoku at 23's (9.9)
(2) is the hardest sudoku at 25's (9.9)

That means that you need 23 seconds with a computer to get the answer?
It's seem incredible for me!

Ocean just discovered this 21-clue puzzle with a rating of 10.0:


What is OCEAN????
What is the rating 10:0?

Thanks for your answer
(I never play sudoku : I code generator and solvcer only!!!:D )
Papy
 
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Re: Sorry I don't understand

Postby fermat » Thu Aug 17, 2006 5:15 pm

(1) is the hardest sudoku at 23's (9.9)

This means that the hardest puzzle found with 23 clues is rated 9.9 out of 10 by Sudoku Explainer. (Adress below).

http://diuf.unifr.ch/people/juillera/Sudoku/Sudoku.html

"Ocean" is one of prominent user names here.
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Brute force

Postby Papy » Thu Aug 17, 2006 6:36 pm

Thanks for your answer
I don't speak enougth english to well understand: Ocean is a forum user?

I Read the link about Sudoku explainer we don't have (european and american) the same concept about a brute force and a recursive algorythm
A recursive alogo is a logical algo wich use intermediate result and a BF only try the solutions 1 by 1to find the good solution
You need to compute all the solution and test them one by one...
We have two kind of solver: by elimination or by hypothése so a good solvcer (for us) use only elimination or only hypothese.
It's more difficult!

Actually the challenge is to reconize a grid and the same with perutations!
and in fact to determine if the grid have a unique solution WITHOUT solved it!!!
Have you idea on the other side of Ocean (Atlantique)

Papy
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Re: Brute force

Postby fermat » Fri Aug 18, 2006 4:17 am

Papy wrote:Thanks for your answer
I don't speak enougth english to well understand: Ocean is a forum user?

We have two kind of solver: by elimination or by hypothése so a good solvcer (for us) use only elimination or only hypothese.
It's more difficult!

Papy


Ocean is: a member, a poster, a user-name.

Sudoku Explainer uses logic and shows it. No guessing.
fermat
 
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Explaijer

Postby Papy » Fri Aug 18, 2006 7:43 am

Thanks for Ocean I find is profile!!!!

but I not agree with
Sudoku Explainer uses logic and shows it. No guessing.


Why ? Because SE use , for example, Nishio and Nishio is 'guessing'
no logic
You try some value look if the resiult is good, go back and try other value!
It's not 'logic' but guessing

It's what I think but it's not necessaty true!:?:
But SE is a good job!
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