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Difficultness

 
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oaxen



Joined: 10 Jul 2006
Posts: 96

PostPosted: Thu Jan 03, 2013 11:30 am    Post subject: Difficultness Reply with quote

As far I can see from daily sudoko and other media there is only one producer who supply real difficult puzzles. Menneske, impossible. However as he delivers randomly it is hard to to see how many of this kind he has, and sometimes I receive a puzzles I already solved. Anybody who knows how to open all of them? More hints of very difficult puzzles?
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TNova



Joined: 17 Jul 2012
Posts: 16
Location: Bromley, UK

PostPosted: Thu Jan 03, 2013 1:39 pm    Post subject: Reply with quote

Hi Oaxen,

If you are looking for some more difficult Sudoku puzzles then there are plenty of free programs available on the net which will generate them. The one I use is Hodoku which can be downloaded from the link below. The level of difficulty can be chosen by the user - if you try "hard" you will get a puzzle with a similar difficulty level as most of the Menneskes posted on this board. The more difficult levels are very tough indeed.

http://hodoku.sourceforge.net/en/index.php
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Marty R.



Joined: 12 Feb 2006
Posts: 5064
Location: Rochester, NY, USA

PostPosted: Thu Jan 03, 2013 4:43 pm    Post subject: Reply with quote

Quote:

As far I can see from daily sudoko and other media there is only one producer who supply real difficult puzzles.


"Real difficult", like beauty, is in the eye of the beholder. Most sites, including Menneske, offer a variety of levels of difficulty. A site that I use a lot is Vanhegan. Their Fiendish can be challenging and their Extreme often live up to the name.

http://www.playr.co.uk/sudoku/index.php
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keith



Joined: 19 Sep 2005
Posts: 3136
Location: near Detroit, Michigan, USA

PostPosted: Thu Jan 03, 2013 7:07 pm    Post subject: Reply with quote

Oaxen,

Other forums than this one have had threads on "the most difficult sudoku puzzles".

There is even a file of extremely difficult puzzles used to test sudoku solvers.

I don't recall ever getting the same random Menneske twice, but the odds of doing so are certainly better than the odds of winning the lottery!

Keith
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Jan 14, 2013 4:08 pm    Post subject: Reply with quote

a site that I rarely see referenced is

"krazydad sudoku" just google it.

he has 1000's of puzzles in like 5 or 6 different difficulty levels

his highets difficulty level has probably the widest range of extreme type puzzles. some of which would give any solver a run for their money, let alone being able to understand the techniques to solve them.

the issue with krazydad's site is he does not provide a way to easily copy them. so you are left with transfering the puzzle by hand.

his easiest puzzles are great for printing out for pencil paper.
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keith



Joined: 19 Sep 2005
Posts: 3136
Location: near Detroit, Michigan, USA

PostPosted: Mon Jan 14, 2013 6:28 pm    Post subject: Reply with quote

storm_norm wrote:
a site that I rarely see referenced is

"krazydad sudoku" just google it.

he has 1000's of puzzles in like 5 or 6 different difficulty levels

his highets difficulty level has probably the widest range of extreme type puzzles. some of which would give any solver a run for their money, let alone being able to understand the techniques to solve them.

the issue with krazydad's site is he does not provide a way to easily copy them. so you are left with transfering the puzzle by hand.

his easiest puzzles are great for printing out for pencil paper.

Have you suggested that he make his puzzles available as an 81-character string? Not for mass downloads, but so it can be cut & pasted into Nataraj' formatter or into Sudoku Susser.

Keith
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Jan 14, 2013 7:28 pm    Post subject: Reply with quote

keith wrote:
storm_norm wrote:
a site that I rarely see referenced is

"krazydad sudoku" just google it.

he has 1000's of puzzles in like 5 or 6 different difficulty levels

his highets difficulty level has probably the widest range of extreme type puzzles. some of which would give any solver a run for their money, let alone being able to understand the techniques to solve them.

the issue with krazydad's site is he does not provide a way to easily copy them. so you are left with transfering the puzzle by hand.

his easiest puzzles are great for printing out for pencil paper.

Have you suggested that he make his puzzles available as an 81-character string? Not for mass downloads, but so it can be cut & pasted into Nataraj' formatter or into Sudoku Susser.

Keith


yep, got his response too.

here it is


----------------------

I'm happy to provide puzzles in text format to the sudoku community and academic researchers upon request. I have an undocumented API that returns both regular sudoku and killer sudoku puzzles in this JSON format.

Code:
    {
        puzzle_id: "KD_Sudoku_EZ-B1-P2",
        puzzle_data:
        {
            blockH: 3,
            diff: "1",
            solved: "369185742254796813871342956542671398638954271197823465423519687985267134716438529",
            puzz: ".6...57.2..4.96.1.8713.2...5...713...3..5..7...782...5...5.9687.8.26.1..7.64...2.",
            blockW: 3,
            sOrder:"2,6,7,9,12,14,15,17,19,20,21,22,24,28,32,33,34,38,41,44,48,49,50,54,58,60,61,62,63,65,67,68,70,73,75,76,80,4,13,23,42,51,69,78,5,8,66,43,52,16,71,26,45,18,72,36,11,27,25,29,39,55,79,81,10,64,74,77,1,3,30,37,40,46,47,53,56,57,59,31,35",
            numSymbols: 9,
            ptitle: "jbum-1-1"
        },
        comments: "diff=1, clues=37, logic=0x003, logP=1, mults=0, redC=5, Ns,Hs ",
        creation_date: "2012-08-20 14:49:58"
    }



Jim


Last edited by storm_norm on Mon Jan 14, 2013 10:24 pm; edited 1 time in total
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Marty R.



Joined: 12 Feb 2006
Posts: 5064
Location: Rochester, NY, USA

PostPosted: Mon Jan 14, 2013 10:20 pm    Post subject: Reply with quote

Would someone like to translate that into English?
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