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 

Oct 23

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



Joined: 30 Sep 2012
Posts: 2
Location: New jersey

PostPosted: Wed Oct 24, 2012 12:29 am    Post subject: Oct 23 Reply with quote

I'm having a hard time solving -- I thought I had the obvious moves but I seem to be stuck now. Any clues? Perhaps I've made an error along the way. Thanks.
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Wed Oct 24, 2012 1:38 am    Post subject: Reply with quote

Hi James, welcome to the forum.

Could you post the grid where you're stuck? There's information on how to post a grid here:

http://www.dailysudoku.co.uk/sudoku/forums/viewtopic.php?t=1905
Back to top
View user's profile Send private message
jamesmrice



Joined: 30 Sep 2012
Posts: 2
Location: New jersey

PostPosted: Wed Oct 24, 2012 12:11 pm    Post subject: Reply with quote

This is the puzzle I was referring to but for some reason it is not the puzzle now listed for Oct 23, medium difficulty.

This difficulty was unknown when I printed it. When I just used the draw and play function the web site recognized the puzzle and knew the original markings. This is as far as I got:

Thank you. I thought that was pretty neat how the Sweep, etc, worked!

Code:

+----------------+------------------+--------------+
| 7    2    1389 | 3589   4    589  | 6   1589 159 |
| 48   5    489  | 6      7    1    | 3   489  2   |
| 1348 1489 6    | 2      389  589  | 489 7    159 |
+----------------+------------------+--------------+
| 6    148  7    | 134589 1389 4589 | 49  2    139 |
| 9    14   5    | 134    6    2    | 7   134  8   |
| 2    3    148  | 1489   189  7    | 5   149  6   |
+----------------+------------------+--------------+
| 458  6    489  | 489    2    3    | 1   589  7   |
| 35   1489 2    | 7      189  489  | 89  6    35  |
| 138  7    1389 | 189    5    6    | 2   389  4   |
+----------------+------------------+--------------+

Play this puzzle online at the Daily Sudoku site
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Wed Oct 24, 2012 3:53 pm    Post subject: Reply with quote

James, I have no idea what your experience in Sudoku is. I think I see a Swordfish on 9 in rows 279, but I can't see where it opens things up. Maybe someone else will come along with some suggestions.
Back to top
View user's profile Send private message
JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Wed Oct 24, 2012 6:29 pm    Post subject: Reply with quote

Solution using only single digit techniques ...

1. Empty Rectangle (1R8B4) :=> -1r6c5 [Not required]
2. Finned Swordfish(8C257) :=> -8r4c46
3. Finned Swordfish(8C267) :=> -8r3c5
4. Swordfish(9R2B79) :=> -9r1c3, -9r8c56, -9r16c9
5. Pointing : 9r7c4=9r9c4 :=> -9r146c4

=> r6c5=9, r3c5=3=r1c3

6. Swordfish(8C257) :=> -8r3c16, -8r8c6

=> r1c6=8; cascade of singles to the end.
Back to top
View user's profile Send private message
harrybro



Joined: 25 Oct 2012
Posts: 1

PostPosted: Thu Oct 25, 2012 6:58 am    Post subject: Reply with quote

I think I see a Swordfish on 9 in rows 279, but I can't see where it opens things up.
Back to top
View user's profile Send private message
JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Thu Oct 25, 2012 8:24 am    Post subject: Reply with quote

harrybro wrote:
I think I see a Swordfish on 9 in rows 279, but I can't see where it opens things up.

Swordfish(9R279) :=> "-9r146c348" & Claiming : 9r7c4=9r9c4 :=> -r8c56 & r6c5=9
After that : SF(8C257) :=> r1c6=8 or r8c6=4; stte
Back to top
View user's profile Send private message
Pat



Joined: 23 Feb 2010
Posts: 207

PostPosted: Thu Nov 08, 2012 4:01 pm    Post subject: Reply with quote


    puzzles solved with a Swordfish are not so rare;
    puzzles solved with 2 Swordfish — are rare
keith wrote:
Please post puzzles that "require" a swordfish.
We'll see what other solution paths there are.
Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Thu Nov 08, 2012 4:29 pm    Post subject: Reply with quote

Or one wing Very Happy

Code:
 *-----------------------------------------------------------------------------*
 | 7       2       1389    | 3589    4       589     | 6       1589    159     |
 | 48      5       489     | 6       7       1       | 3      d48-9    2       |
 | 1348    1489    6       | 2       389     589     |c489     7       159     |
 |-------------------------+-------------------------+-------------------------|
 | 6       148     7       | 134589  1389    4589    | 49      2       139     |
 | 9       14      5       | 134     6       2       | 7       134     8       |
 | 2       3       148     | 1489    189     7       | 5       149     6       |
 |-------------------------+-------------------------+-------------------------|
 | 458     6       489     | 489     2       3       | 1      a589     7       |
 | 35      1489    2       | 7       189     489     |b89      6       35      |
 | 138     7       1389    | 189     5       6       | 2       389     4       |
 *-----------------------------------------------------------------------------*
L-wing
9r7c8=(9-8)r8c7=(8-4)r3c7=4r2c8 => -9r2c8; lclste
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