So, I've been reading up on forcing chains & bivalue plots as these seem to be the next level of technique I need to acquire to solve the really tough problems, and the following question has come to mind.
For those of you out there that are working on these tough problems using these techniques, are you doing this work by hand on paper, or are you using some type of computer software?
I tend to enjoy solving puzzles using software because I can avoid the tedium of having to write in all the pencilmarks and erase them as eliminations are made. I also really like Simple Sudoku's filtering and coloring features (although sometimes I wish there were 6 colors instead of 4).
Anyway, I have not really gotten to the point where I can identify these chains, nice loops, etc. in my head, so I'm wondering if everyone else out there is doing this stuff with pencil and paper.
I welcome all your comments on what works for you.
Thanks,
Jeff