Jellyfish technique not working fine for this puzzle

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Jellyfish technique not working fine for this puzzle

Postby kk123 » Sun Mar 30, 2008 6:25 am

I reached following position (pls see the attached image) in solving a puzzle,

http://rapidshare.com/files/103463417/untitled1.jpg.html

I applied "Jellyfish" technique to the columns 1,4 and 9 (highlighted in cyan, all containing 9s), and trying to eliminate all other 9s in the respective rows (highlighted in pink). I am unable to eliminate 9 in the cell r1c5. Why?[/url]
kk123
 
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Joined: 29 March 2008

Postby daj95376 » Sun Mar 30, 2008 3:31 pm

I suggest that you learn to post puzzles like everyone else in this forum:!:
daj95376
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Postby eleven » Sun Mar 30, 2008 5:30 pm

kk123, i saw that you use SimpleSudoko. Press Edit/Copy or CTRL+C to copy puzzle and grid. Then you can paste it to a posting (or editor) with CTRL+V or right mouse click & Paste.
In the posting mark it with the mouse and click on the "Code" button to get this (use the Preview button to check it):
Code: Select all
 *-----------*
 |...|3.8|.76|
 |3..|716|..4|
 |6.7|.4.|...|
 |---+---+---|
 |1..|875|632|
 |276|43.|5.8|
 |853|6..|..7|
 |---+---+---|
 |.6.|.83|7.1|
 |73.|164|..5|
 |.1.|2.7|.6.|
 *-----------*

 
 *--------------------------------------------------------------------*
 | 459    249    12459  | 3      259    8      | 129    7      6      |
 | 3      289    2589   | 7      1      6      | 289    2589   4      |
 | 6      289    7      | 59     4      29     | 12389  12589  39     |
 |----------------------+----------------------+----------------------|
 | 1      49     49     | 8      7      5      | 6      3      2      |
 | 2      7      6      | 4      3      19     | 5      19     8      |
 | 8      5      3      | 6      29     129    | 149    149    7      |
 |----------------------+----------------------+----------------------|
 | 459    6      2459   | 59     8      3      | 7      249    1      |
 | 7      3      289    | 1      6      4      | 289    289    5      |
 | 459    1      4589   | 2      59     7      | 3489   6      39     |
 *--------------------------------------------------------------------*

I wonder, if you just wanted us to see the rapidshare site (be sure i dont like it), because SS tells you as a next step that there is a single 1 in box 1. It also has no problem to solve it with x-wing and swordfish. Both techniques are well described on the Simple Sudoku site.
However - after the x-wing i would take a xy-wing to solve it, for me easier to see than a swordfish.

Now to your question: A jellyfish needs 4 rows/columns the candidate is restricted to. Your marked candidates (in rows 1369) are only restricted to 3 columns, as you mentioned.
eleven
 
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Postby kk123 » Mon Mar 31, 2008 6:07 pm

Thanks guys,

I had misunderstood the Jellyfish technique and was applying it wrongly!! Well it should be 4 rows and 4 columns.

"The candidate can appear less than 4 times in a row" was interpreted by me as "I can have 4 rows and <= 4 columns" -that was my mistake.

Next time I will copy and paste from Simple Sudoku, I did not know that.
kk123
 
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Joined: 29 March 2008


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