Samantha Joy, it sounds to me like you discovered a pair of naked pairs.
...and in hard puzzles at this site, naked pairs are common.
Done, no greens. And thanks, Dr. Who, for giving me the term to Google.
Oh, and Happy Birthday, Doctor!!
What are the greens that everyone always mentions?
You have to press the shift keys to put greens in & the alt key to put in reds. You can also grab a bookmarklet that will automate the process for you from http://www.brittlefish.com/
when would you us the red as apposed to the green?
Samantha Joy: thanks for the birthday wishes, but I don't think it is my birthday. However, after more than 700 years one tends to loose track of such things.
ellenz: it's up to your ingenuity to figure that out. I used them a couple of times when I was using trial and error to help me back track. But I haven't done that for a long time now.
Hmmm... I think I should have said lose track, not loose track of my birth date.
O well, grammar school was a long time ago too.
I've found that a sonic screwdriver is much more useful than good grammar.
ellenz; You could use Green as "Might be's" and Red as "Probably nots" for example.
It's up to you, a color is only a color, the implied meanings "green is good" "red is bad" are only arbitrary values that you have learnt.
And drwho, I have a loose track on one of my kitchen cupboards could you sonic screwdriver be used to fix it?