Heh, hate to jump in the middle of this, but if you want to relate a phase of the game (opening, mid, end) to a foundation, I think it would have to be the endgame. Why are certain opening ideas good or bad? Because they transition into good or bad middlegames. Why are middlegames good or bad? Because of the endgame. You can't properly evaluate what's in front of you if you don't understand where you're headed...
Unless you always attack and win/lose in
I had previously explained that is why for beginners in particular, it is good to study end games and tactics more so that openings. At some point however, if your opening is so bad you don't make it to the middle or end game, all of that study was moot.
My undeniable basis Joey keeps trying to deny in vein, is that it doesn't really matter what parts of chess you learn first, as long as you learn all of the necessary parts to play well and execute a winning game plan. I expressed this as it applies to players about class a or master and up, that is the point at which it becomes more critical to study openings.
Hmm, I don't agree that you can learn any piece first and it doesn't matter. In fact I can't quite imagine any area of learning this would be true.
Certainly learning things "out of order" as it were won't prevent someone from becoming an expert in that area, but it may make it much more difficult.
In particular opening study is fairly useless at U1800 USCF IMO. I'm only just now intigrating advice like "don't move too many pawns in the opening" and "complete development before undertaking operations" into my actual evaluations. Honestly how many games do you have where your opponent makes 1 or 2 too many pawn moves and now you can prove a lasting advantage?
Once you can handle middlegame evaluations and have some experience in navigating the transition between opening and middlegame, you can start to appreciate opening theory (which I still don't appreciate myself really, I mostly try to get playable positions where clear ideas exist).
Endings have lots of good nugets in them for beginners though. Harmony of pieces (need to work together to accomplish anything), visualization and calculation (endgames often require calculation), other than the useful knowing where your efforts in earlier phases are headed.
That's the best I can do for making my case. Honestly, it's pretty hard to know what I'm talking about until you experience it yourself.
It's kind of funny, actually. The best I can say I have done with my chess, is that I have actually learned to follow advice I've heard since I was a beginner. I, too, heard that endings are a great way to learn chess, didn't believe it because I couldn't understand their perspective, and so I "did my own thing." Now that I actually understand the reason for the advice, because of my experience, I finally follow it, even though I knew it since I was rated 1000.
But if you really want me to be as wrong as possible, netzach, that's all I can do. I'm sorry I had good intentions and wanted to help. Nothing wrong with being skeptical, of course. Beginners, and any player, can study how they want, and hopefully they will find something that works for them. In my case, I went back to the old advice only after having bad experiences when going against it.
I really love this comment, because I keep experiencing this (maybe you're done with it, but I don't think I am). The advice beginner books are packed with is much more useful and implications farther reaching than I could have possibly imagined when I was beginning chess.