## Help solving - a clue

Advanced methods and approaches for solving Sudoku puzzles

### Help solving - a clue

Hello, I have the following board:

*62 9*4 ***
*** 3** 4**
38* *** ***

*** *6* 3*4
6** 4*2 **7
2*9 *1* ***

*** *** *83
*91 **6 ***
*** 5*8 61*

I got till here

*62 9*4 *3*
9** 3** 4**
384 6** ***

*** 869 324
638 452 197
249 713 ***

**6 1*7 *83
891 236 745
**3 5*8 61*

Thanks,
Janiv Ratson.
janiv

Posts: 10
Joined: 15 June 2005

You need a technique sometimes called "disjoint subsets."

Look at where 1, 5 and 7 can go in row 2. This allows you to eliminate some candidates and make a placement.
Last edited by simes on Sun Dec 11, 2011 2:34 pm, edited 1 time in total.
simes

Posts: 324
Joined: 11 March 2005
Location: UK

how?
row2:
{9},{1,5,7},{5,7},{3},{2,8,7},{1,5},{4},{5,6,7},{1,2,6,8} !
how can I figuire something from this row ?
Thanks again,
Janiv Ratson.
janiv

Posts: 10
Joined: 15 June 2005

Hi Janiv

Simes is right, take a very close look at the cells r2c2, r2c3 and r2c6 and work out what are the only three digits that can go in these cells.

This is an excellent example of disjoint subsets (also known as a hidden triplet, in this case). For my explanation of disjoint subsets, click here, and scroll down.

Hope this helps,

George
george-no1

Posts: 150
Joined: 20 May 2005