I can't help but wonder...

[TargetPractice6]

I wonder if this was adapted from what I originally posted:

http://www.ht-arena.com/leonce/?page=Counter%20Attacking%20maths%20101

Not saying it was, or even that what I posted was completely original or difficult to come up with. It just kind of seems to be in the same format. :)

[Vince]

That's actually the first thing I thought of when I saw it up there, TP. :)