I agree, and ya with me it was some tactics, but mostly opening heavy study.
And the reason they are improving is because they have a coach to explain the pawn structure plans and piece set up of the various openings they play to them, and then whenever they play a game their coach can critique their play and show them ways to correct their positional/tactical mistake. Not to mention I'm sure the coach gives them tactical puzzles, or a tactical workout all the time, as well as teaching them GM games to explain positional, pawn structure, and tactical ideas.
Basically they are being flooded with chess information, motivated to improve, and their basic chess framework: tactics, positional play, pawn structure plans, and endgames, are being built up heavily, as well as their specialized chess knowledge: openings. You are just noticing the openings :), but honestly knowing openings isn't effective without the base knowledge.
Just like if a boxer hasn't even tried strength training or conditioning it doesn't matter how much specialized knowledge he has of styles and punches, he's going to be demolished. Where as when he is already physically powerful and has good conditioning, his style, execution of various punches and tricks becomes quite important.
Oh certainly, if I left the impression all they study is openings, then my mistake. The kids are absolute whizzes at tactics and have good positional understanding. The only thing I havent really seen is endgames, I dont know how well they know those, but at the scholastic level the majority of games are G30 or G45 so endgames play a lesser role anyway.
But they are balanced.
I also went through Silman "Reassess your chess", which did nothing for me. But I came from a different background, my very first chessbook, when I was about 8 or so, (and a truly horrible first book for someone) was "New Ideas in Chess" by Larry Evans, which I read multiple times at that age and dog eared it. But as I read Reassess you chess, all I could think was how that book was virtually a modern day revision of the Evans book, but with "Bishop vs Knight" thrown in, perhaps to make it seem less obvious. Space, Time, Force, and Pawn structures were things I learned before really knowing pins, forks, and discovered attacks very well. Ah, if only I had someone at that age to tell me tactics was what I should be studying most heavily...
interesting discussion....which I am sure has been carried on hundreds of times with the same 2 camps forming lol.
I guess I lean slightly toward the "dont get too wrapped up into openings until your are fairly strong" camp.
I have no doubt that one can easily make it to class A without being a serious opening theory guy. Of course one cant be an idiot in the opening and do well, but as some have said, learn PRINCIPLES and you will generally come out of the opening in at least ok shape
I would think that especially with d4 one could do ok with slightly less specific knowledge simply because d4 doesnt usually lead to a super sharp game as much as e4 does.
I'm 1862 uscf, based on like 28 games or so, and to be honest, in most of the games so far I have been out of book by move 4 or 5, sometimes earlier.
Im pretty sure I can make it to expert without learning a TON of opening theory.
That being said, I am superclueless about the endgame and can say that maybe 3 of my tourney games ever make it to any kind of endgame struggle?
My calculation skills and visualization arent THAT great (im 46, lol)
So how did I get to 1862 pretty quickly? I dont know but pretty much just trying to get solid positions and notice when the opponent makes a mistake..which he WILL at my level
I work the most on tactics and lately I AM "studying" openings some, but my memory sux.
I have gotten some of my wins based on the other guys just playing sort of weak opening play. Not that I burned them with a deep trap or some memorized idea, but just that they were too passive or I found ways to try to impede their development and they get tied in knots etc
Ill give one example game from my last tourney:
So the game was sort of lost in the opening, but not due to some long memorized variation but due to basic principles