@GM erichansen: As they're have been some slight disagreements among a few players, all of which were masters, and one, a Senior Master. My question is how much theory do you need to become a really strong chess player? I know some of the basics, which is what GM Kasporov emphasizes, but even then, I have a hard time with all of them. And, it's just the basics. So, how advanced does one need to go?
You'll get different answers from different people and there's no real right answer. If you have the extra time to get good at theory then I'd go for it. I didn't study openings until I was master level.
What do you think is the best opening?
Plenty of good openings out there. I enjoy open positions so for me the sicilian and grunfeld defences are among my favorites.