## Sudoku Beginner, Learning Fast, but stumped by this one...

Advanced methods and approaches for solving Sudoku puzzles

### Sudoku Beginner, Learning Fast, but stumped by this one...

Could someone explain what logic I need to use to complete the following sudoku (this is as far as I get, then I don't know what techniques to use!):

1 9 5 - 6 8 4 - (2/3) (2/3) 7
6 7 2 - 5 9 3 - 1 8 4
3 4 8 - (1/2) 7 (1/2) - 6 5 9
4 6 7 - (8/9) 2 (8/9) - 5 1 3
5 2 1 - 7 3 6 - (4/9) (4/9) 8
9 8 3 - 4 1 5 - 7 6 2
(2/8) (1/3) 9 - (1/2/3/8) 5 (1/2/7/8) - (2/3/4/8) (2/3/4/7) 6
(2/8) 5 6 - (2/3/8/9) 4 (2/7/8/9) - (2/3/8/9) (2/3/7) 1
7 (1/3) 4 - (1/2/3/8/9) 6 (1/2/8/9) - (2/3/8/9) (2/3/9) 5

I have left spaces between each component and have put options for the missing values in brackets -trial and error seems the only option, but there must be a way (please help!)

(apologies if this is not clear, and if you have to write this out again to make it clearer)
Rishi

Posts: 3
Joined: 16 August 2005

That is an Invalid Puzzle.

There are 47 different solutions for it.
Xenon

Posts: 6
Joined: 15 August 2005

That's good to know because it means it wasn't something I had missed! (I copied the puzzle from the cover of a book and must have missed a number or perhaps it was just an invalide puzzle!).

BTW how did you work out there are 47 solutions to it so quickly?! -did you use a computer program?
Rishi

Posts: 3
Joined: 16 August 2005

I just had another look on the website selling the book and noticed I had missed copying down three numbers!

in the bottom right hand grid
co-ordinate 7,8 = 2
co-ordinate 7,9 = 8

-this makes things a lot easier now (I didn't fair too badly even without these!)

-thanks for your help
Rishi

Posts: 3
Joined: 16 August 2005

I just put it into Simple Sudoku.
Xenon

Posts: 6
Joined: 15 August 2005