see the thing is, even if anyone COULD do this with enough work. how many people will work hard enough for it!?
I do not doubt MANY people could improve tons and tons if they played chess and studied their loses; tactics, basic endgames....I'm even more sure that MOST PEOPLE WON'T.
I'm as addicted to chess as I have to anything and I wounder if I really am willing to hard enough to see real and lasting chess improvement. its easier to talk about than do...
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Yes,it is. Reshevsky and Fischer both proved this...and more.But you probably are not addressing the "prodigy"issue.You are prob wondering if "Joe Static" can go from novice to master in five years.You don't have to be a prodigy to make this happen.But you almost certainly will need a good teacher to critique/develop your style,repertoire of openings and defences,and provide OTB experience. It only takes work,willingness to focus,and a little smidgeon of "killer intstinct" :) .