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The universal language of Sudoku?

 
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keith



Joined: 19 Sep 2005
Posts: 3184
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
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keith



Joined: 19 Sep 2005
Posts: 3184
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
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keith



Joined: 19 Sep 2005
Posts: 3184
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
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daj95376



Joined: 23 Aug 2008
Posts: 3855

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
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keith



Joined: 19 Sep 2005
Posts: 3184
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
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
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
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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.
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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.
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keith



Joined: 19 Sep 2005
Posts: 3184
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
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