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 

Sep 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: 665
Location: Dar es Salaam Tanzania

PostPosted: Mon Sep 16, 2013 10:44 pm    Post subject: Sep 17 VH Reply with quote

Code:

+------------+---------+-----------+
| 6  347 47  | 5 1  23 | 78  278 9 |
| 8  9   1   | 7 26 4  | 3   26  5 |
| 2  37  5   | 8 69 39 | 67  4   1 |
+------------+---------+-----------+
| 3  *58  89  | 1 4  7  | 2   *5-9  6 |
| 1  47  479 | 2 5  6  | 79  3   8 |
| 57 6   2   | 9 3  8  | 157 17-5 4 |
+------------+---------+-----------+
| 57 1   78  | 4 29 29 | 568 68-5 3 |
| 9  *58  3   | 6 7  1  | 4   *58  2 |
| 4  2   6   | 3 8  5  | 19  19  7 |
+------------+---------+-----------+
X-Wing on 5 in row 48; r67c8<>5 opens an
XY-Wing 79-17-19 pivoted in r6c8; r4c8<>9, stte.
Back to top
View user's profile Send private message AIM Address
arkietech



Joined: 31 Jul 2008
Posts: 1718
Location: Northwest Arkansas USA

PostPosted: Tue Sep 17, 2013 12:35 am    Post subject: Reply with quote

Code:
 
 *--------------------------------------------------*
 | 6    347  47   | 5    1    23   | 78   278  9    |
 | 8    9    1    | 7    26   4    | 3    26   5    |
 | 2    37   5    | 8    69   39   | 67   4    1    |
 |----------------+----------------+----------------|
 | 3    58   89   | 1    4    7    | 2   a59   6    |
 | 1    47   479  | 2    5    6    | 79   3    8    |
 |c57   6    2    | 9    3    8    |17-5 c157  4    |
 |----------------+----------------+----------------|
 | 57   1    78   | 4    29   29   | 568  568  3    |
 | 9    58   3    | 6    7    1    | 4    58   2    |
 | 4    2    6    | 3    8    5    | 19  b19   7    |
 *--------------------------------------------------*
(5=9)r4c8-(9=1)r9c8-(1=75)r6c18 => -5r6c7; ste
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Tue Sep 17, 2013 3:38 am    Post subject: Reply with quote

Same two moves as Clement.

(I edited his post to correct puzzle date).
Back to top
View user's profile Send private message
hughwill



Joined: 05 Apr 2010
Posts: 172
Location: Birmingham UK

PostPosted: Tue Sep 17, 2013 9:46 am    Post subject: Sep 17 VH Reply with quote

Code:

+------------+---------+-----------+
| 6  347 47  | 5 1  23 | 78  278 9 |
| 8  9   1   | 7 26 4  | 3   26  5 |
| 2  37  5   | 8 69 39 | 67  4   1 |
+------------+---------+-----------+
| 3  58  89  | 1 4  7  | 2   59  6 |
| 1  47  479 | 2 5  6  | 79  3   8 |
| 57 6   2   | 9 3  8  | 157 157 4 |
+------------+---------+-----------+
| 57 1   78  | 4 29 29 | 568 568 3 |
| 9  58  3   | 6 7  1  | 4   58  2 |
| 4  2   6   | 3 8  5  | 19  19  7 |
+------------+---------+-----------+

Play this puzzle online at the Daily Sudoku site

A second X wing on 5 in columns 1 and 7 does the same first step as
Clement and Marty.

BTW I've never quite followed Dan's solutions!
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Tue Sep 17, 2013 12:58 pm    Post subject: Reply with quote

Quote:
BTW I've never quite followed Dan's solutions!


It helps to learn Eureka notation, which I decided to learn a few years too late, but better late than never.

What he's saying is that if r4c8=9, then r6c7=1. If r4c8=5, then r6c7=17. Either way it can't be =5.
Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1718
Location: Northwest Arkansas USA

PostPosted: Tue Sep 17, 2013 3:27 pm    Post subject: Re: Sep 17 VH Reply with quote

hughwill wrote:
I've never quite followed Dan's solutions!

Code:


(5=9)r4c8-(9=1)r9c8-(1=75)r6c18 => -5r6c7; ste
  |                    |
  |                    |
if r4c8 is not 5 then           
                        r6c18 is 75

                                Therefore r6c7 cannot be 5

                                            singles to end


Hope this helps
Back to top
View user's profile Send private message
hughwill



Joined: 05 Apr 2010
Posts: 172
Location: Birmingham UK

PostPosted: Wed Sep 18, 2013 9:16 am    Post subject: Sep 17 VH Reply with quote

arkietech said:

Quote:
Hope this helps



Thanks Dan, it does. Thanks also to Marty.

Does the solution have a name?

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



Joined: 31 Jul 2008
Posts: 1718
Location: Northwest Arkansas USA

PostPosted: Wed Sep 18, 2013 12:11 pm    Post subject: Re: Sep 17 VH Reply with quote

hughwill wrote:
Does the solution have a name?


ALS XY-wing (Almost Locked Set)

remove the 1 from r6c18 and you have a locked set that makes a pincher.
Back to top
View user's profile Send private message
millan



Joined: 18 Sep 2013
Posts: 1

PostPosted: Wed Sep 18, 2013 12:37 pm    Post subject: solve sudoku Reply with quote

It's not easy to solve sudoku but I want to learn.
Back to top
View user's profile Send private message Visit poster's website
Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Wed Sep 18, 2013 4:55 pm    Post subject: Re: solve sudoku Reply with quote

millan wrote:
It's not easy to solve sudoku but I want to learn.


Feel free to ask your questions anytime.
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