## What method for this Challenger Sudoku from World Sudoku Spr

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

### What method for this Challenger Sudoku from World Sudoku Spr

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.
JeJ

img251.imageshack.us/i/sudoku1d.jpg
JeJ

Posts: 76
Joined: 06 January 2011

### Re: What method for this Challenger Sudoku from World Sudoku

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

Tarek

tarek

Posts: 2802
Joined: 05 January 2006

### Re: What method for this Challenger Sudoku from World Sudoku

It won't help if you plan to use the red cells to solve a vanilla 9x9 Sudoku puzzle.
daj95376
2014 Supporter

Posts: 2624
Joined: 15 May 2006

### Re: What method for this Challenger Sudoku from World Sudoku

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
JeJ

Posts: 76
Joined: 06 January 2011

### Re: What method for this Challenger Sudoku from World Sudoku

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      | *--------------------------------------------------------------------*`
daj95376
2014 Supporter

Posts: 2624
Joined: 15 May 2006

### Re: What method for this Challenger Sudoku from World Sudoku

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).
JeJ

Posts: 76
Joined: 06 January 2011

### Re: What method for this Challenger Sudoku from World Sudoku

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 35 6 8|7 1 3|9 4 22 3 1|9 4 6|5 7 8-----------------8 2 5|3 6 1|4 9 71 9 4|8 7 5|2 6 33 7 6|4 2 9|8 1 5-----------------6 1 3|5 8 4|7 2 97 5 9|6 3 2|1 8 44 8 2|1 9 7|3 5 6`
JeJ

Posts: 76
Joined: 06 January 2011

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

Pat

Posts: 3690
Joined: 18 July 2005

### Re: What method for this Challenger Sudoku from World Sudoku

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.

StrmCkr

Posts: 900
Joined: 05 September 2006