## Need help to go further on this one

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

### Need help to go further on this one. First time on here.

Code: Select all
`           9XX   X3X   7XX        XXX   X5X   X69        7XX   X19    2X3                 XXX   14X    5XX        X8X   5X3    X1X        XX2   X68    XXX           2X1   3XX    XX5        X3X   X8X    XXX        XX7   XXX    XX4        `
busino06

Posts: 3
Joined: 01 April 2006

Hi,

You must be new to sudoku.

In the left-lower 3x3 box, there is only one position left for digit 8.

Ruud.
Ruud

Posts: 664
Joined: 28 October 2005

Hey thx Ruud,yes I`m new at this.
busino06

Posts: 3
Joined: 01 April 2006

busino06 wrote:Hey thx Ruud,yes I`m new at this.

Then you're probably stuck again after placing 8 in row 9, column 1 (r9c1=8)

Look at r6c9.
1 - can't go there because of the 1 in r5c8
2 - can't go there because of the 2 in r6c3
3 - can't go there because of the 3 in r3c9
etc. for all candidates except 7

Since there is only one digit that can go there, you can solve r6c9=7

So you have two techniques now,

r9c1=8 because there was no other cell in its box that could be 8.
In general, find the only cell in some box, row or column where you can put some candidate.

r6c9=7 because no other candidate would be legal here.
In general, find a cell where only one candidate can fit.

Those are all you need to solve this puzzle, but it will be tough.

Have fun!

Mac
QBasicMac

Posts: 441
Joined: 13 July 2005

Hey thx all,needed that.
busino06

Posts: 3
Joined: 01 April 2006