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 

Still more Eureka

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



Joined: 12 Feb 2006
Posts: 5123
Location: Rochester, NY, USA

PostPosted: Sun Nov 11, 2012 1:01 am    Post subject: Still more Eureka Reply with quote

This is the Fiendish from Nov. 9 that Dan posted on the other forum. How would my first move be notated? The 9 in A makes B=4 which creates an 89 pair in C which takes out the 9 from D and then 59 from E. I'm fairly confident that what I wrote is incorrect.

Code:
 *-------------------------------------------------------------*
 | 7      56     1     | 89    2     56    | 89    3     4     |
 | 689    3      4     | 7     89    56    | 2     589   1     |
 | 89     2      589   | 1     4     3     | 7     589   6     |
 |---------------------+-------------------+-------------------|
 | 2     D59    E569   | 39    7     4     | 139   1-69  8     |
 | 1      479   -679   | 2389  89    28    | 349  A69    5     |
 | 3     C489   C89    | 6     5     1     |B49    2     7     |
 |---------------------+-------------------+-------------------|
 | 4      678    3     | 5     16    9     | 18    178   2     |
 | 689    689    2     | 48    16    7     | 5     148   3     |
 | 5      1      78    | 248   3     28    | 6     478   9     |
 *-------------------------------------------------------------*

(6=9)r5c8-(9=4)r6c7-(4=NP89)-(9=5)r4c2-(59=6)r4c3-->r5c8, r6c3<>6
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun Nov 11, 2012 10:51 am    Post subject: Re: Still more Eureka Reply with quote

Marty R. wrote:
This is the Fiendish from Nov. 9 that Dan posted on the other forum. How would my first move be notated? The 9 in A makes B=4 which creates an 89 pair in C which takes out the 9 from D and then 59 from E. I'm fairly confident that what I wrote is incorrect.

Code:
 *-------------------------------------------------------------*
 | 7      56     1     | 89    2     56    | 89    3     4     |
 | 689    3      4     | 7     89    56    | 2     589   1     |
 | 89     2      589   | 1     4     3     | 7     589   6     |
 |---------------------+-------------------+-------------------|
 | 2     D59    E569   | 39    7     4     | 139   1-69  8     |
 | 1      479   -679   | 2389  89    28    | 349  A69    5     |
 | 3     C489   C89    | 6     5     1     |B49    2     7     |
 |---------------------+-------------------+-------------------|
 | 4      678    3     | 5     16    9     | 18    178   2     |
 | 689    689    2     | 48    16    7     | 5     148   3     |
 | 5      1      78    | 248   3     28    | 6     478   9     |
 *-------------------------------------------------------------*

(6=9)r5c8-(9=4)r6c7-(4=NP89)-(9=5)r4c2-(59=6)r4c3-->r5c8, r6c3<>6


Three comments:
1: You forgot to include the cells involved in the NP89 term; otherwise it is a valid statement although it is not necessary to include the notation "NP".
(6=9)r5c8-(9=4)r6c7-(4=89)r6c23-(9=5)r4c2-(59=6)r4c3-->r5c8, r6c3<>6

2: The next two terms dealing with the NP59 are awkward but probably understandable. An alternative is to treat the NP59 in the same manner as the prior NP89.
(6=9)r5c8-(9=4)r6c7-(4=89)r6c23-(59=6)r4c23-->r5c8, r6c3<>6

3: Another alternative for the notation is to treat the four cells in box 4 as a single als(45689).
(6=9)r5c8-(9=4)r6c7-(4=6)r64c23 --> r5c8, r6c3<>6
I have also seen other posts that include the "als" notation when the als is large/involved.
(6=9)r5c8-(9=4)r6c7-als(4=6)r65c23 --> r5c8, r6c3<>6

Ted
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5123
Location: Rochester, NY, USA

PostPosted: Sun Nov 11, 2012 6:03 pm    Post subject: Reply with quote

Thanks Ted and welcome back. Very Happy
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