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Oct 23

 
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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.
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
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
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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
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
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.
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JC Van Hay



Joined: 13 Jun 2010
Posts: 372
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.
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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.
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JC Van Hay



Joined: 13 Jun 2010
Posts: 372
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
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Pat



Joined: 23 Feb 2010
Posts: 165

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.
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arkietech



Joined: 31 Jul 2008
Posts: 1727
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
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