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 

April 17 VH

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles
View previous topic :: View next topic  
Author Message
Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Sat Apr 16, 2011 10:24 pm    Post subject: April 17 VH Reply with quote

XY-Wing 19 18 89 pivoted in r5c1 solves it by setting r9c9<>9.
Back to top
View user's profile Send private message AIM Address
Ema Nymton



Joined: 17 Apr 2009
Posts: 89

PostPosted: Sun Apr 17, 2011 10:13 am    Post subject: Reply with quote

.

The solution "XY-Wing 19 18 89 pivoted in r5c1 solves it by setting r9c9<>9." not withstanding, a question comes up.

Code:

+-------------+----------+--------------+
| 4   8    1  | 25 7  59 | 239 6   239  |
| 3   259  57 | 26 1  69 | 279 8   4    |
| 279 29   6  | 8  4  3  | 5   129 1279 |
+-------------+----------+--------------+
| 27  2456 9  | 1  36 8  | 237 245 237  |
| 18  14   3  | 7  5  2  | 6   49  89   |
| 278 256* 57 | 9  36 4  | 1   25  2378 |
+-------------+----------+--------------+
| 5   3    2  | 4  9  1  | 8   7   6    |
| 6   19   4  | 3  8  7  | 29  129 5    |
| 19  7    8  | 56 2  56 | 4   3   19   |
+-------------+----------+--------------+


At this point in the puzzle, using 'HINT' results in r6c2 = '6'.
Is it possible to learn the reasoning behind the clue given by 'HINT'?

Ema Nymton
.
Back to top
View user's profile Send private message
peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sun Apr 17, 2011 1:34 pm    Post subject: Reply with quote

Ema, I don't know if the "hint" button gives you a "logical solver" next step or just picks a cell to give you the answer to!

But in row 4 you have a naked triple 237 which makes r4c5=6 and so r6c2=6..
Back to top
View user's profile Send private message
Pat



Joined: 23 Feb 2010
Posts: 207

PostPosted: Sun Apr 17, 2011 2:10 pm    Post subject: Reply with quote

or i'd say,
in r4 there's a "hidden" duo {4,5}
-- which solves the 6 for c2
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun Apr 17, 2011 4:06 pm    Post subject: Reply with quote

The XY-Wing also works as an 891, pivoted in r5c9; r9c1<>1.

Quote:
Ema, I don't know if the "hint" button gives you a "logical solver" next step or just picks a cell to give you the answer to!

Peter, the hints are based on a logical step.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles 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