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 is this one difficult? 
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Posted on: Fri Aug 03, 2012 9:27 pm




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Joined: Thu May 12, 2011 9:58 pm
Post is this one difficult?
I'm testing the Killer Sudoku rating. The puzzle below is supposed to be (very) difficult. Is it?

(puzzle removed, please see the new one 3 posts lower)


Last edited by pnm on Sat Aug 04, 2012 11:38 am, edited 1 time in total.



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Posted on: Sat Aug 04, 2012 10:15 am




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Joined: Sun Oct 16, 2011 8:58 am
Post Re: is this one difficult?
Maybe difficult but not very difficult.


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Posted on: Sat Aug 04, 2012 10:28 am




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Joined: Thu May 12, 2011 9:58 pm
Post Re: is this one difficult?
arjen wrote:
Maybe difficult but not very difficult.

Thanks :)

I tried it myself as well, made a mistake somewhere [confused],
but do agree it's not very difficult.


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Posted on: Sat Aug 04, 2012 11:37 am




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Post Re: is this one difficult?
This one is supposed to be more difficult than the first one:

Image

Is it?


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Posted on: Sat Aug 04, 2012 12:50 pm




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Joined: Fri May 13, 2011 4:51 pm
Post Re: is this one difficult?
pnm wrote:
I'm testing the Killer Sudoku rating. The puzzle below is supposed to be (very) difficult. Is it?

(puzzle removed, please see the new one 3 posts lower)


I did the first (already removed), I think in fact it's easier than the typical everyday "medium".


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Posted on: Sat Aug 04, 2012 6:40 pm




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Joined: Fri May 13, 2011 4:51 pm
Post Re: is this one difficult?
pnm wrote:
This one is supposed to be more difficult than the first one:

...

Is it?


Yes, it's more difficult and more interesting, doable, it takes some more time in the analysis, having increased the size of the cages (six 5-cell cages, two every three columns). The key for the solution is given, in my opinion, by the cage 20 (5-cell) located in d2.


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Posted on: Sat Aug 04, 2012 9:12 pm




Posts: 282
Location: Ladysmith, BC, Canada
Joined: Thu May 12, 2011 11:37 pm
Post Re: is this one difficult?
pnm wrote:
I'm testing the Killer Sudoku rating. The puzzle below is supposed to be (very) difficult. Is it?

(puzzle removed, please see the new one 3 posts lower)


The original one was very difficult for me as i tried a number of different combinations and continually got stopped about 1/2 way through the puzzle.......once you put in cages of 3 cells or more and multiples of these cages, I AM DONE.......I will probably not be able to do any with the 3 or more celled cages.....and here I thought my IQ was going to increase with the calcudoku (after all isn't that what the site tells us [biggrin] )


Last edited by beaker on Sat Aug 04, 2012 9:47 pm, edited 2 times in total.



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Posted on: Sat Aug 04, 2012 9:42 pm




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Joined: Sat May 14, 2011 1:18 am
Post Re: is this one difficult?
It looked like I was going to get it fairly quickly, based on how many cells I was able to determine in columns g, h, and i. The lower left 3x3 seemed fairly straightforward as well. But then I struggled with the rest of it--even after determining the value of cell e5 in the 20+ cage clm mentioned.

In the end, I got all the rows, columns, and 3x3 grids to add up to 45, but the 31+ cage starting at a1 only contained 29 (-2), and the 28+ cage starting at d2 contained 30 (+2). [sad] Can't figure out how to resolve that. So yeah. Pretty hard. [razz]


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Posted on: Sat Aug 04, 2012 10:04 pm




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Post Re: is this one difficult?
Great, thanks to all so far, this gives me a good idea
for various parameter settings for the generating algorithm [thumbup]


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Posted on: Sun Aug 05, 2012 6:46 am




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Joined: Fri May 13, 2011 4:51 pm
Post Re: is this one difficult?
pnm wrote:
Great, thanks to all so far, this gives me a good idea
for various parameter settings for the generating algorithm [thumbup]


Now that you have the software adjusted (and even with colours! :-) ) it's time for you to think in also publishing a new book with only "Killer's" (other people "outside" this wonderful Calcudoku world could be very interested). I give an initial idea: 50 easy, 50 medium and 101 difficult, with the same punctuation, 3, 5 and 7 for the solutions sent to this site. [thumbsup]


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