What method for this Challenger Sudoku from World Sudoku Spr

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What method for this Challenger Sudoku from World Sudoku Spr

Postby JeJ » Mon Jan 10, 2011 5:00 am

Could someone please tell me what method should be used to finish this sudoku. I highlighted the original numbers that came with it in red, wrote the ones I've found in black and the candidates are in green.
Thanks in advance.
JeJ

img251.imageshack.us/i/sudoku1d.jpg
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Re: What method for this Challenger Sudoku from World Sudoku

Postby tarek » Mon Jan 10, 2011 9:24 am

Hi Jej,

Please read the post at http://forum.enjoysudoku.com/new-topics-how-to-ask-for-help-t2664.html that shows how to post a puzzle state in a way that would allow a more effective help

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Re: What method for this Challenger Sudoku from World Sudoku

Postby daj95376 » Mon Jan 10, 2011 4:30 pm

It won't help if you plan to use the red cells to solve a vanilla 9x9 Sudoku puzzle.
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Re: What method for this Challenger Sudoku from World Sudoku

Postby JeJ » Mon Jan 10, 2011 4:41 pm

I'm sorry I had read those rules, but for some reason I thought my method might also be valid, my apologies.

Here's in the approved notation:

Original Sudoku:
img204.imageshack.us/i/sudoku2.gif


What I have so far(I used 5 spaces for each cell since there are 5 pencilmarks on colum 3 row 3):
img80.imageshack.us/i/sudoku3.gif
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Re: What method for this Challenger Sudoku from World Sudoku

Postby daj95376 » Mon Jan 10, 2011 6:48 pm

You are still using graphical images and making us transcribe the contents. On top of that, you have <3> in the wrong cell in [b1].

Code: Select all
 *-----------*
 |9..|..8|...|
 |...|...|942|
 |.3.|.4.|5..|
 |---+---+---|
 |..5|36.|..7|
 |..4|...|2..|
 |3..|.29|8..|
 |---+---+---|
 |..3|.8.|.2.|
 |759|...|...|
 |...|1..|..6|
 *-----------*

At this point, you found the <16> Naked Pair in [c1], but you missed two other Naked Pair. They crack the puzzle!

Code: Select all
 *--------------------------------------------------------------------*
 | 9      4      127    | 27     5      8      | 6      137    13     |
 | 5      678    678    | 67     1      3      | 9      4      2      |
 | 1268   3      12678  | 9      4      26     | 5      178    18     |
 |----------------------+----------------------+----------------------|
 | 28     28     5      | 3      6      14     | 14     9      7      |
 | 16     9      4      | 8      7      15     | 2      136    135    |
 | 3      167    167    | 45     2      9      | 8      16     145    |
 |----------------------+----------------------+----------------------|
 | 16     16     3      | 45     8      45     | 7      2      9      |
 | 7      5      9      | 246    3      246    | 14     18     148    |
 | 4      28     28     | 1      9      7      | 3      5      6      |
 *--------------------------------------------------------------------*
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Re: What method for this Challenger Sudoku from World Sudoku

Postby JeJ » Mon Jan 10, 2011 7:21 pm

I'm sorry I was so dumb I didn't realise that one of the purpose of having a standard notation was to avoid people wanting to help, to have to write down numbers instead of just copying them. Believe me in my first try I wrote them but then they came up all looking on uneven columns and rows. I didn't see the instructions on how to do it properly on the "how to ask for help thread" but now I have.

Regarding the sudoku I posted thanks for your help on the missing pairs I hadn't noticed. I'll check them and try to solve it and if not I'll come back asking again (with standard code this time).
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Re: What method for this Challenger Sudoku from World Sudoku

Postby JeJ » Mon Jan 10, 2011 9:46 pm

Just to test I learned how to use the proper notation, I am going to write here the solution to the game I asked before about:

Code: Select all
9 4 7|2 5 8|6 1 3
5 6 8|7 1 3|9 4 2
2 3 1|9 4 6|5 7 8
-----------------
8 2 5|3 6 1|4 9 7
1 9 4|8 7 5|2 6 3
3 7 6|4 2 9|8 1 5
-----------------
6 1 3|5 8 4|7 2 9
7 5 9|6 3 2|1 8 4
4 8 2|1 9 7|3 5 6
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Postby Pat » Wed Jan 12, 2011 12:30 pm

Code: Select all

 9 . . | . . 8 | . . .
 . . . | . . . | 9 4 2
 . 3 . | . 4 . | 5 . .
-------+-------+------
 . . 5 | 3 6 . | . . 7
 . . 4 | . . . | 2 . .
 3 . . | . 2 9 | 8 . .
-------+-------+------
 . . 3 | . 8 . | . 2 .
 7 5 9 | . . . | . . .
 . . . | 1 . . | . . 6


daj95376 wrote:
you found the <16> Naked Pair in [c1],
but you missed two other Naked Pair. They crack the puzzle!

sorry i'm late to the party
but no Pairs are needed for this puzzle

after "singles" --
Code: Select all

 9 4 . | . . 8 | 6 . .
 5 . . | . . 3 | 9 4 2
 . 3 . | 9 4 . | 5 . .
-------+-------+------
 . . 5 | 3 6 . | . . 7
 . . 4 | 8 . . | 2 . .
 3 . . | . 2 9 | 8 . .
-------+-------+------
 . . 3 | . 8 . | 7 2 9
 7 5 9 | . 3 . | . . .
 4 . . | 1 9 7 | 3 5 6


b3 8: in r3
solves the 8 for c1
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Re: What method for this Challenger Sudoku from World Sudoku

Postby StrmCkr » Thu Jan 27, 2011 1:09 pm

b3 8: in r3
solves the 8 for c1


agreed, u will notice when u investigate these so called world cham puzzles from compition require very little in acutall solving techniques
usually blr. singles and the occasion xy wing they pretty vanilla all around.

yip im late for chiming in too..
Some do, some teach, the rest look it up.
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