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 

Please help me!!

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



Joined: 09 Apr 2013
Posts: 2
PostPosted: Tue Apr 09, 2013 6:59 am    Post subject: Please help me!! Reply with quote
hi, I've had a few days off work and decided to become better at Sudoko! It was all going well until today. I am trying to complete the hard classic puzzle from friday 8th march.

I have filled in the first 10 moves in exactly the same way as the hint button suggests me to, but then I get stuck, I can see no further moves after several attempts at looking at it.

The hint button then tells me to to put a 9 in the top right corner of the bottom left square.

Why? why? why? I don't see it at all.

Please help Very Happy

Cheers in advance

Paul
Back to top
View user's profile Send private message
JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Tue Apr 09, 2013 10:52 am    Post subject: Reply with quote
I don't know if your are using pencilmarks or not !
In any case,
    with well identified bilocals (I am using .,-,| under candidates of a bilocal in a box, row, column respectively)
    or by looking at the pattern of givens,
it should not be too difficult to detect
    the hidden pair 57 in column 7 (look at the 57 in the right middle box),
    followed by an hidden pair 34 in the bottom row 9 (look at the 34 in row 8 )
    and a naked pair 57 in row 9 (look at the candidates in column 6).
Code:
+-----------------------+------------------+-------------------------+
| 5     34   347        | 67    467   8    | 2        9        1     |
| 1478  14   2          | 3     5     9    | 6        478      48    |
| 478   9    6          | 2     47    1    | -34(57)  3478     3458  |
+-----------------------+------------------+-------------------------+
| 146   2    148        | 79    3     67   | 14       5        489   |
| 9     5    13         | 8     2     4    | 13       6        7     |
| 346   7    348        | 59    1     56   | 34       2348     23489 |
+-----------------------+------------------+-------------------------+
| 1347  134  -13457(+9) | 1567  67-9  2    | 8        1347     345   |
| 17    6    157        | 4     8     3    | 9        127      25    |
| 2     8    -157(34-9) | 1-57  9-7   (57) | (57-34)  -17(34)  6     |
+-----------------------+------------------+-------------------------+
In short,
    HP(57)C7 :=> -34r3c7 and -34r9c7;
    HP(34)R9 :=> -1579r9c3 and -17r9c8, :=> +9r7c3;
    NP(57)R9 :=> -57r9c4 and -7r9c5;
    Singles to the end.
Back to top
View user's profile Send private message
PaulH



Joined: 09 Apr 2013
Posts: 2
PostPosted: Tue Apr 09, 2013 12:27 pm    Post subject: Reply with quote
Thank you for taking the time to reply.

I have followed it through (successfully!) and have been welcomed to the world of HP and NP!

Thanks again Very Happy

Paul
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