## What to do when all slots have more than one possibility?

Advanced methods and approaches for solving Sudoku puzzles

### What to do when all slots have more than one possibility?

Im new to Sudoku and found this puzzle where every open slot has at least two possibilities, what would be the next step?

Thanks a bunch.

Code: Select all
` _ _ _   4 6 _   1 _ __ _ 2   1 _ _   7 8 _1 _ _   8 _ 2   _ _ 45 7 1   6 _ _   4 _ __ _ _   2 4 1   _ _ __ _ 4   _ _ 5   _ 3 18 1 7   3 2 6   5 4 9_ 5 6   _ _ 4   2 1 __ _ _   5 1 _   _ _ _`
Cram

Posts: 3
Joined: 25 August 2005

As well as checking which numbers can be in the cells, it's important to check which cells in a particular row/column/box can hold each number. So, in your example, if you look at the third row down, there's only one cell that the 7 can be in (the middle one).
PaulIQ164

Posts: 533
Joined: 16 July 2005

Check out the solving techniques at
http://www.paulspages.co.uk/sudoku/howtosolve/

It is an extremely helpful sudoku site. Pay attention to 1. crosshatching, 2. slicing & dicing, and 3 pencilling in. When you move on to more difficult puzzles pay attention to the rules about pairs, triplets, and such

Ken
kf-ryan

Posts: 3
Joined: 26 August 2005