I have very little opening knowledge, get into a slightly better (0.1) middlegame with white, no risk, with black, I know one opening that I've played my whole chess career, am able to generally get to nearly even middlegames despite my opponents almost always having more overall opening knowledge than me by far, and can beat them out in late middlegame/ending. Obviously if you have very little opening knowledge and you go stumbling into main lines, things won't go well, but if you go for less played, more system-ish openings with just general ideas, you'll be fine.
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