dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

The universal language of Sudoku?

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Solving techniques, and terminology
View previous topic :: View next topic  
Author Message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Fri Jul 03, 2009 1:01 am    Post subject: The universal language of Sudoku? Reply with quote

I have long been frustrated by the different notations used. So, here is a challenge: Is there a universal notation?

The rules are: I post a particular stage of Wapati's puzzle, and the notation wonks agree on notating that step. Then, we move on to the next step that needs a refined notation.

To start:

Code:
7 4 .|. 6 .|. . .
. 5 .|3 . .|. 4 .
8 . .|. . .|. 1 .
-----+-----+-----
. 2 1|. . 4|5 7 .
5 . .|. . .|. . 1
. 7 4|1 . .|6 9 .
-----+-----+-----
. 3 .|. . .|. . 4
. 1 .|. . 2|. 6 .
. . .|. 5 .|. 8 2


Notation 1

R6C1 is forced. What is the notation?

Keith


Last edited by keith on Fri Jul 03, 2009 1:20 am; edited 1 time in total
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Fri Jul 03, 2009 1:15 am    Post subject: Reply with quote

Code:
+-------------------+-------------------+-------------------+
| 7     4     29    | 2589  6     189   | 289   3     59    |
| 1269  5     269   | 3     1789  1789  | 2789  4     679   |
| 8     69    2369  | 24579 479   79    | 279   1     5679  |
+-------------------+-------------------+-------------------+
| 69    2     1     | 689   89    4     | 5     7     3     |
| 5     689   689   | 6789  3789  36789 | 4     2     1     |
| 3     7     4     | 1     2     5     | 6     9     8     |
+-------------------+-------------------+-------------------+
| 269   3     26789 | 6789  1789  16789 | 179   5     4     |
| 49    1     5789  | 4789  34789 2     | 379   6     79    |
| 469   69    679   | 4679  5     13679 | 1379  8     2     |
+-------------------+-------------------+-------------------+

Notation 2

R2C1 is pinned. What is the notation?

Keith


Last edited by keith on Fri Jul 03, 2009 1:21 am; edited 1 time in total
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Fri Jul 03, 2009 1:19 am    Post subject: Reply with quote

Code:
+-------------------+-------------------+-------------------+
| 7     4     29    | 259   6     1     | 8     3     59    |
| 1     5     269   | 3     79    8     | 279   4     679   |
| 8     69    3     | 24579 479   79    | 279   1     5679  |
+-------------------+-------------------+-------------------+
| 69    2     1     | 689   89    4     | 5     7     3     |
| 5     8     69    | 679   3     679   | 4     2     1     |
| 3     7     4     | 1     2     5     | 6     9     8     |
+-------------------+-------------------+-------------------+
| 2     3     8     | 679   1     679   | 79    5     4     |
| 49    1     5     | 4789  4789  2     | 3     6     79    |
| 469   69    7     | 469   5     3     | 1     8     2     |
+-------------------+-------------------+-------------------+

Notation 3

There is a naked pair <79> in B2. What is the notation?

Keith
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Fri Jul 03, 2009 2:08 am    Post subject: Reply with quote

[Withdrawn: not sure of Keith's objective.]

Last edited by daj95376 on Fri Jul 03, 2009 7:32 am; edited 1 time in total
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Fri Jul 03, 2009 4:21 am    Post subject: Reply with quote

Danny,

Thank you!

I will wait a day or two for other responses before going further.

Keith
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Fri Jul 03, 2009 10:55 pm    Post subject: Reply with quote

Keith,

Yes we talked about this before but it never got past verbiage.

I would like to fully understand what you mean by notation. For example, Notation #1 could be a "Naked single" or "Forced". Are these examples of what you want?

Also, given multiple suggestions are offered for any condition, how is a decision made?

In any case, my initial suggestions are:

Notation 1: Naked single
Notation 2: Hidden single
Notation 3: Naked pair

Good Luck. I really hope something positive happens.

Ted
Back to top
View user's profile Send private message
wapati



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

PostPosted: Sat Jul 04, 2009 12:26 am    Post subject: Reply with quote

I like English.

It borrows from many languages.

There are sudoku methods that do the same.

Skyscraper is a Turbot and a sashimi-x-wing, and a finned-x-wing.

Oops, skys are also chains and other stuff.

I'm not sure what you want but I like the current variety in nomenclature.
Back to top
View user's profile Send private message
wapati



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

PostPosted: Sat Jul 04, 2009 12:30 am    Post subject: Reply with quote

I suspect that to get one convention all would be listed as chains, or worse.

I prefer bottom up, lots of methods and names moving towards .. chain>net>whatever.

To satisfy what you seem to want all steps would be top down...net/chain one or two step.
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Thu Jul 09, 2009 1:30 am    Post subject: Reply with quote

All,

My suggestion here does not seem to have wings. (Pun intended.)

What I will do is start a thread on notation. This is the mathematical type of language that Norm and others use to explain their chains. A subset of this is how we use notation on the grids themselves.

There are two other issues, and maybe in a week or two we can start these discussions also:

1) A discussion of the names and variants of techniques. This seems to be Wapati's interest.

2) A classification of the "difficulty" of a technique, perhaps based on the number of unknowns involved. I started Ted down this path a few weeks ago, then dropped the ball.

Best wishes,

Keith
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Solving techniques, and terminology All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group