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pwcediting
Joined: 26 Jun 2011 Posts: 7

Posted: Sun Jun 26, 2011 3:26 am Post subject: Numerical phenomena for each row and column 


Have you ever noticed that on each finished Sudoku, that there's a certain pattern of numbers in each set of 3 rows across and each set of 3 rows down? There's always two numbers that repeat in each cube row, and the one number that doesn't repeat add up to a certain number that repeats each of 3 times going across in that row of cubes. Am I making any sense to anyone out there? I often use it to check to make sure I've solved a puzzle correctly, although it doesn't always help. 

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wapati
Joined: 10 Jun 2008 Posts: 472 Location: Brampton, Ontario, Canada.

Posted: Sun Jun 26, 2011 4:05 pm Post subject: 


nope, i have not looked at finished puzzles much. Interesting idea. it may suggest a solving method? Bigger brains may provide insight. I suspect it is already covered. 

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pwcediting
Joined: 26 Jun 2011 Posts: 7

Posted: Mon Jun 27, 2011 1:13 am Post subject: Numerical phenomena for each row and column 


This may already be covered somewhere, but I've never seen it. If any of you have ever seen it, well you'll understand how mathematical it makes all sudoku puzzles, not just because of their unique answers (and I copied one from a Quick Magazine, and got two other solutions than it did for 6/23/11), but because of the mathematical patterns noticed by few if any. It causes me (outside of online sudokus) to put the unique number outside of each set of 3 rows and columns, to see if there's any further patterning effect. Usually not. (But thanks Wapati, for replying to my firstever post.) 

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Luke451
Joined: 20 Apr 2008 Posts: 310 Location: Southern Northern California

Posted: Mon Jun 27, 2011 6:00 am Post subject: 


I'm still lost.
Can you post an example and make your case with it? 

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Asellus
Joined: 05 Jun 2007 Posts: 865 Location: Sonoma County, CA, USA

Posted: Mon Jun 27, 2011 9:50 am Post subject: 


Sounds like it might be what is referred to as Braid Analysis, also perhaps called "moving pairs" or something like that. I can't recall the details other than it had to do with certain patterns that occur within the floors/towers of completed puzzles. Some people used it to help solve puzzles but it never seemed to catch on. My own casual impression long ago was that it didn't seem that helpful and was rather tedious to employ so I didn't pursue it, hence my vague recollection. 

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Pat
Joined: 23 Feb 2010 Posts: 182

Posted: Mon Jun 27, 2011 1:42 pm Post subject: re: Quick Magazine 


pwcediting wrote: 
I copied one from a Quick Magazine,
and got two other solutions than it did for 6/23/11 
never seen that magazine 
could you please post an example?
esp. an example such as you cite 
"two other solutions than it did" thanks! 

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pwcediting
Joined: 26 Jun 2011 Posts: 7

Posted: Mon Jun 27, 2011 1:57 pm Post subject: Numerical phenomena for each row and column 


I like what you said, Asellus, about "moving pairs" since that's what it mostly resembles. Luke451, I'd like to post an example, but I'm not sure how. I can email you a Word document in which I embed a puzzle, and then show the pairings outside each of the sides, floors/towers of such a puzzle, since I don't know if I can add an image to this post. I'm very new at this, so give me some clues or a way to reach you on FB so we can touch base via email in some discreet way. TY
I have an idea. I will give the first 3 rows of a solution of the Quick puzzle, below, and then show you the pairs:
9 8 5 3 7 6 1 4 2
2 3 6 5 1 4 9 7 8
1 7 4 9 8 2 5 6 3
You see the "985," the "982," and "978"? Each has a "98" in common, and the different numbers, 5, 2, and 7 add up to 14. Now, take, 236, 376, and 563; the common pair is "36"; the other numbers (same as before) add up to 14. Finally, take 174, 514, and 142, and the common pair is "14" and 7, 5 & 2 add to 14. You will see different pairings in each set of 3 rows or columns, where the other numbers in each set always add up to the same sum. Now, do you follow me, Luke451 and others? Do you also see where this could be helpful, in that the same "other" numbers are used in a set? Now, you'll have to realize that in a partially completed puzzle, you can hypothesize more than one set of common pairs for a given set of numbers: you'll just have to try it on completed puzzles and then incomplete puzzles, to see what I mean. Thanks for listening. PWC[/b] 

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Pat
Joined: 23 Feb 2010 Posts: 182

Posted: Mon Jun 27, 2011 2:08 pm Post subject: 


pwcediting wrote: 
I will give the first 3 rows of a solution of the Quick puzzle, below, and then show you the pairs: Code: 
9 8 5 3 7 6 1 4 2
2 3 6 5 1 4 9 7 8
1 7 4 9 8 2 5 6 3


thanks
i'd still like to see the original puzzle (before looking at the answer) 

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pwcediting
Joined: 26 Jun 2011 Posts: 7

Posted: Mon Jun 27, 2011 2:42 pm Post subject: Numerical phenomena for each row and column 


Neither the puzzle nor the answer(s) was the subject of these posts. Since I recopied the puzzle from Quick Magazine (Dallas, TX) into Daily Sudoku, the solutions have long since gone by the wayside. But since the solution it showed wasn't unique, I'd be interested in other people doing the puzzle to see whether they get the same results as Quick did.
What's the best way to do that? I'll use dots instead of blanks below:
. . 53 . . . 4 .
. . . . 1 . . 7 .
. 7498 . . . .
. . 9 . . . . 3 1
3 . . . . . . . 4
42 . . . . 6 . .
. . . . 6529 .
. 6. . 9 . . . .
. 9. . . 83 . .
If you take these numbers and fill them into a blank Daily Sudoku form, you can solve the puzzle. Then, when you repost, I can post the solution, and then show the "Braid Analysis" or "moving pairs" for each set of 3 rows or columns. 

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Luke451
Joined: 20 Apr 2008 Posts: 310 Location: Southern Northern California

Posted: Tue Jun 28, 2011 1:02 am Post subject: 


Here ya go.
Code:  **
..53...4.
....1..7.
.7498....
++
..9....31
3.......4
42....6..
++
....6529.
.6..9....
.9...83..
**
**
985376142
236514978
174982563
++
659427831
318659724
427831659
++
843165297
761293485
592748316
**



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pwcediting
Joined: 26 Jun 2011 Posts: 7

Posted: Tue Jun 28, 2011 2:51 am Post subject: Numerical phenomena for each row and column 


OK, Luke 451, here are the sums on the top caps from left to right: 17, 19, 17; and the sums on the sides going from top to bottom: 14, 0, 15. From there, you can tell me the pairs of numbers (e.g., 985, 982, 978 yields 98 (or 89), corresponding to the 14). And, these relate directly to your posts.
17 19 17
**
985376142
236514978 14 (98, 36, 14)
174982563
++
659427831
318659724 0 (no pairs; all 3 numbers repeat each time)
427831659
++
843165297
761293485 15 (48, 16, 29)
592748316
**
And remember, these "moving pairs" and correspondences are true for any Sudoku that you've ever done or ever will do, unless it's got more than 9 boxes. I've seen the Monster Sudokus with 16 boxes, and have never tried to solve one, let alone look for mathematical relationships.
Blest regards. 

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Pat
Joined: 23 Feb 2010 Posts: 182

Posted: Tue Jun 28, 2011 10:23 am Post subject: 


pwcediting wrote: 
Neither the puzzle nor the answer(s) was the subject of these posts.
Since I recopied the puzzle from Quick Magazine (Dallas, TX) into Daily Sudoku,
the solutions have long since gone by the wayside.
But since the solution it showed wasn't unique,
I'd be interested in other people doing the puzzle
to see whether they get the same results as Quick did.
Code: 
. . 5  3 . .  . 4 .
. . .  . 1 .  . 7 .
. 7 4  9 8 .  . . .
++
. . 9  . . .  . 3 1
3 . .  . . .  . . 4
4 2 .  . . .  6 . .
++
. . .  . 6 5  2 9 .
. 6 .  . 9 .  . . .
. 9 .  . . 8  3 . .


i'm sorry that you consider my question offtopic
the fact is that you've accused the magazine of publishing a flawed puzzle ( a puzzle with more than one answer )
so i'm glad i got you to post the puzzle
as we can all see, it has exactly one answer 

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pwcediting
Joined: 26 Jun 2011 Posts: 7

Posted: Tue Jun 28, 2011 3:54 pm Post subject: Numerical phenomena for each row and column 


Thanks, Pat.
Actually, I wasn't accusing the magazine of a flawed puzzle. I didn't know that a puzzle had to have only one answer. Why isn't it possible for one puzzle out of ... to have more than one answer? I don't know how I came up with 2 other answers, unless I miscopied a number. I'll recopy the numbers again, and see what happens.
Did you get the point of the numerical phenomena? 

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ronk
Joined: 07 May 2006 Posts: 398

Posted: Tue Jun 28, 2011 4:48 pm Post subject: 


http://sudopedia.org/wiki/Traveling_Pairs circa Nov 2006. Without using the full power of Braid Analysis, I use traveling pairs and traveling triples as an alternate POV to ... to ... gee, I'm not sure what they're alternate to. 

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pwcediting
Joined: 26 Jun 2011 Posts: 7

Posted: Tue Jun 28, 2011 7:12 pm Post subject: Numerical phenomena for each row and column 


Hi, Ronk,
I'll check out the site you posted, and get back with you later. 

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keith
Joined: 19 Sep 2005 Posts: 3285 Location: near Detroit, Michigan, USA

Posted: Tue Jun 28, 2011 9:44 pm Post subject: 


The posted puzzle has a single solution and does not require advanced moves.
If you want advice on posting puzzles or images, scroll down to the "Site Help" thread.
Since this methods seems to have no dependence on starting values, how does it exclude deadly patterns in any reliable way?
Keith 

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