## Just starting harder puzzles-need help with swordfish

Post the puzzle or solving technique that's causing you trouble and someone will help

### Just starting harder puzzles-need help with swordfish

I know that this puzzle has triples, pointing pairs, etc. and I got most of them but I got to a point where I missed a triple and tried the swordfish technique.
58XX9X3XX
2X3X14XXX
94XXXXXXX
X5493X8X1
832146XX7
1XXX8543X
XXXXXXXX3
XXX45X7X9
XX5X2XX8X

I thought I saw a swordfish for 7's based on rows B2,B8,C3,C8,F2,F3
There are 3 rows, 3 columns and no more than 3 7's in the rows. I thought I could eliminate the 7's therefore in columns G2,J2,G3,A3,A8
What did I miss? J2 is a 7. Is my nomenclature ok with letters for rows and numbers for the columns? Thanks for any help.
asajar

Posts: 10
Joined: 09 May 2008

Hi asajar and welcome to the forum!

It would help if you could post a grid with candidates for your stuck state. In the puzzle you posted are additional 7s on the lines 3 and 6, which make the swordfish impossible.

As for letters versus digits, most people on this forum use digits for rows, but we will understand you.
hobiwan
2012 Supporter

Posts: 321
Joined: 16 January 2008
Location: Klagenfurt

Thanks very much for your quick reply. I thought the swordfish rule was you could use a row as long as it had 3 or less candidates.
In row 3 and 6 I had 3 7's and row 2 I had 2 7's.
Also, is there a way to upload a stuck puzzle .jpg or convert a scanned puzzle to text format so I can upload the grid?

Thanks again in helping a newbie--some of the rules make more sense when you can discuss a specific puzzle that gave you trouble.
asajar

Posts: 10
Joined: 09 May 2008

asajar wrote:Also, is there a way to upload a stuck puzzle .jpg or convert a scanned puzzle to text format so I can upload the grid?

Have a look at this thread:

http://forum.enjoysudoku.com/viewtopic.php?t=2664

Simple Sudoku is a nice tool to give text format output. You can find it here:

http://www.angusj.com/sudoku

I think from scanned puzzles you need to input the clues into the program manually by hand, but there might be some other programs which can do OCR from pics.

asajar wrote:I thought the swordfish rule was you could use a row as long as it had 3 or less candidates.
In row 3 and 6 I had 3 7's and row 2 I had 2 7's.

http://www.sudopedia.org/wiki/Swordfish

Your grid might be in the following state:
Code: Select all
`+----------------------+----------------------+----------------------+| 5      8      167    | 267    9      27     | 3      1467   46     || 2     *67     3      | 58     1      4      | 69    *679    568    || 9      4     *167    | 358   *67     38     | 126   *1267   2568   |+----------------------+----------------------+----------------------+| 67     5      4      | 9      3      27     | 8      26     1      || 8      3      2      | 1      4      6      | 59     59     7      || 1     *679   *679    |*27     8      5      | 4      3      26     |+----------------------+----------------------+----------------------+| 467    12679  6789   | 678    67     189    | 1256   12456  3      || 36     126    68     | 4      5      138    | 7      126    9      || 3467   1679   5      | 367    2      139    | 16     8      46     |+----------------------+----------------------+----------------------+`

The 7's definite do not form a swordfish. They are 3 rows of candidates spanning across 5 columns, not 3.

The naked pair {46} on column 9 cracks it.
udosuk

Posts: 2698
Joined: 17 July 2005

udosuk"][quote="asajar wrote:Also, is there a way to upload a stuck ]
The 7's definite do not form a swordfish. They are 3 rows of candidates spanning across 5 columns, not 3.
The naked pair {46} on column 9 cracks it.

Thank you so much for your help with this--I obviously misunderstood the concept. It is clear to me now that every element in the rows (not just the possible candidates) must all be in 3 columns.

It is great that there is a website such as this where we newbies to the more advanced concepts can ask questions
asajar

Posts: 10
Joined: 09 May 2008