Thanks in advance for your help...

I tutorialed this site to learn colors:

http://angusj.com/sudoku/hints.php

But the advice was pertaining to cells that only had two possible values.

This 'colors' step is dealing with more than that

***Sudoku from "Simple Sudoku" Expert Level

I am confused as I am only used to 'colors' when there are only 2 values possible in each cell.

For instance...

Why is the suggestion here to eliminate 5's and not 4's?

What cell did you begin the first coloring in?

What was the tip off to use colors?

Any other info would be appreciated, as I am a newbie to this expert level, but I pick up

fast and really enjoy the tougher Sudokus.

Thanks,

LTP