mastering the opening system isn't a matter of memorizing lines and columns of standard moves, nor of matching stockfish accuracy. It's a matter of do you understand the major positional and tactical themes well enough that you play the resulting middlegames with confidence. When you are confident enough of your own understanding, when you "know where the bodies are buried", you find you can play either side of the opening with confidence. When you find that confidence within yourself, you don't have to ask if you have mastered the opening. Until then, practice practice practice.
@lizani said in #10:
> ... In the classic book, 'How to open a chess game', Lajos Portisch says 'Your only task in the opening is to reach a playable middlegame.' ...
https://lichess.org/forum/general-chess-discussion/opening-19
How would I know? I have never done it.
@verylate I can play white b3 and like 99.8 percent I get good positions or atleast equal positions
But idk about playing against my opening as black because I almost never face my opening
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