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 if you have time left 
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Posted on: Tue Nov 29, 2011 5:02 pm




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Post if you have time left
If you have time to spare:

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Posted on: Tue Nov 29, 2011 5:16 pm




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Joined: Fri May 13, 2011 11:30 am
Post Re: if you have time left
gweldig wat een puzzel , dit is een uitdaging....................


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Posted on: Tue Nov 29, 2011 5:55 pm




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Joined: Thu May 12, 2011 9:58 pm
Post Re: if you have time left
rensje wrote:
gweldig wat een puzzel , dit is een uitdaging....................

Maybe nicer to reply in English on the English language forum..

Translated: "Great, what a puzzle, this is a challenge... "

Patrick


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Posted on: Tue Nov 29, 2011 7:42 pm




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Joined: Fri May 13, 2011 4:51 pm
Post Re: if you have time left
pnm wrote:
If you have time to spare:

...


I solved this new and interesting puzzle (first 13x13 in the web and books) and I feel that the level of difficulty (subjective) is similar to some of the 12x12's, probably because, in this initial phase, you have intentionally reduced a little bit that level (by using all cages of 2 cells, except those three 1-cell cages). I am sure that with a more complex distribution and size of cages the level of difficulty will increase considerably.

Suggestion: this could be an interesting alternative to 12x12's any thursday or sunday (two per month or so), to replace the easier 10x10 on fridays, or as an addition any of the other days. Another suggestion: a 14x14 too, because, having the 7 and the 14, the challenge will increase.


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Posted on: Wed Nov 30, 2011 3:50 am




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Location: Canada
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Post Re: if you have time left
Without yet trying to solve the puzzle, perhaps a 13x13 would be easier than a 12x12 because 13 is another prime number which makes it another one of those special numbers like 7 and 11 in a 12x12. It's easier to fit them in because there are only so many places they could be...

And what clm noted about all the 2-cell cages would probably make it easier as well. Now that that's said, I'll go and try it and let you know...


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Posted on: Wed Nov 30, 2011 4:22 am




Posts: 422
Location: Canada
Joined: Fri May 13, 2011 12:43 am
Post Re: if you have time left
Ok, now that I've solved it... I think it is comparable, maybe a little easier than 12x12 but it was a bit hard to say. It took me maybe the same amount of time as 12x12 but I did this in Paint and it takes me longer to scratch in the numbers by mouse...

Agree with clm that this would be an interesting alternative to the 12x12. Say, every first Sunday of the month it is 13x13 instead...


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Posted on: Wed Nov 30, 2011 3:37 pm




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Joined: Fri May 13, 2011 8:23 am
Post Re: if you have time left
To evade adding another prime number (13) maybe make a 13x13 skipping the 13 and adding the 14?

This also takes out the prime 7 in some way....

Or make it a 13x13 0-12?


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Posted on: Wed Nov 30, 2011 4:31 pm




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Location: Lisbon, Portugal
Joined: Sun Sep 18, 2011 3:40 pm
Post Re: if you have time left
And now if you publish another 15x15? I have one in the books but I'm keeping it for a long night of winter!

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Visit http://www.calcudoku.org the most interesting and addictive site of puzzles.


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Posted on: Wed Nov 30, 2011 9:31 pm




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Joined: Fri May 13, 2011 4:51 pm
Post Re: if you have time left
honkhonk wrote:
To evade adding another prime number (13) maybe make a 13x13 skipping the 13 and adding the 14?

This also takes out the prime 7 in some way....

Or make it a 13x13 0-12?


Sure the 0-12 is another variation and good solution for a 13x13.

I like this idea of skipping numbers (and I am not [scared] of the 13), is a new and very imaginative idea, we would keep the same rules and strategies once we know the numbers involved (addition, multiplication, parity, special operations, ...), even we could skip the 7 ( [love] 7) and the 13 in a 13x13, for instance, adding the 14 (in this way the 7 would be "virtually" present via the 14) and the 15 (increasing the number of possibilities whit the 5's, having the 5, 10, 15 as submultiples), or create a new categoy of "skipped puzzles", i.e., a 6x6 with the 2, 3, 4, 5, 7, 9 excluding the 1, 6 and 8, etc., this would differentiate even more the calcudokus from the "sudokus" (there is no sense in skipping in the case of the "sudokus"), we might apply the skipping to puzzles with negative numbers ... or use several quite big numbers in a relatively small sized puzzle, etc., I cann't imagine now how far we could go with this idea.


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Posted on: Wed Dec 07, 2011 1:45 am




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Joined: Fri May 13, 2011 5:14 am
Post Re: if you have time left
Sometimes I feel as if I am out of my league with all the math and programming discussions. So if this question sounds silly, I apologize. I would like to try that 13x13 puzzle, but how do I find out whether the solution I arrive at is correct? I'm accustomed to the error-checking feature and final message "congratulations, you solved the puzzle" on Patrick's site. It's just too tedious to check things for myself. It would be easy to see that each row and column contained only one of each number 1 thru 13. But then the answer to some operation in one of the cages might be wrong, and escape my notice. (I have an unfortunate tendency to make careless errors.)

cecileb


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