Chess is easy

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einWWe
Debate topic: At what elo does chess improvement most suddenly become significantly more difficult and why? I'd like to see arguments for 500 elo, 1000 elo, 1500 elo, and 2000 elo, as I've heard of all 4 of these numbers being potential (approximate) breaking points.
einWWe

(Meant to call it "Chess is easy until ____" or something)