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 

Apr 25 VH(?)

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



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Mon Apr 25, 2016 9:56 am    Post subject: Apr 25 VH(?) Reply with quote

You wait for a VH to come along and it isn't. This one falls through basics
only, though there are many pairs and triples first.

Hugh
Back to top
View user's profile Send private message
the_lock_man



Joined: 18 Dec 2012
Posts: 40
Location: Portsmarfff, UK

PostPosted: Mon Apr 25, 2016 11:34 am    Post subject: Reply with quote

I'm glad it wasn't just me that thought that. Very Happy
Back to top
View user's profile Send private message
RobertRattley



Joined: 24 Jun 2007
Posts: 118
Location: Australia

PostPosted: Mon Apr 25, 2016 1:08 pm    Post subject: Reply with quote

Yes, only "hard". And I don't know about "many pairs and triples": I needed just one triple 137 in row 7.
Back to top
View user's profile Send private message Send e-mail
dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Mon Apr 25, 2016 10:46 pm    Post subject: Reply with quote

So anyway I got to the following point:
Code:

 +-------------+----------------+--------------+
 | 39  1   5   | 2378 367  368  | 2789 237  4  |
 | 6   379 2   | 3578 4    1358 | 5789 137  19 |
 | 8   37  4   | 2357 1357 9    | 257  1237 6  |
 +-------------+----------------+--------------+
 | 7   4   6   | 1    8    2    | 3    9    5  |
 | 1   2   9   | 35   356  356  | 4    8    7  |
 | 5   8   3   | 4    9    7    | 1    6    2  |
 +-------------+----------------+--------------+
 | 349 5   17  | 6    137  13   | 279  1247 8  |
 | 49  6   178 | 5789 2    158  | 79   147  3  |
 | 2   379 178 | 3789 137  4    | 6    5    19 |
 +-------------+----------------+--------------+

And then I says to myself... I says 'Don' I says 'It's a VH so there MUST be a VH move somewhere. Aha! There it is! An X-Wing of 9's in columns 2 and 9! So r9c4<>9 which means r8c4=9 which solves it! Boy, I bet my mother would be proud! (By the way, she was an English teacher.) Then I read the others' posts. ugh. I hate when that happens.
Back to top
View user's profile Send private message
hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Tue Apr 26, 2016 8:23 am    Post subject: Reply with quote

Thanks for that Don. probably explains what the algorithm was using to
suggest it was a VH. I've noticed that before that there are certain box-line
interactions or triples that the programming fails to spot- in this case could it
be that there are two naked triples (both 137) which share two cells? It's an
unusual combination....

Still, it's hard to complain about something that has worked so well over 10
years- so thanks again Sam (even if he's a largely absent landlord!).
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