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Mastering theory & principles and having a deep reading will allow you to play at a high level, but go is so complex that researches have been carried on for centuries to find sequences that offer an even result for both players, josekis and openings. Knowing such patterns, knowing them and how to use them, will allow you to play at an even higher level; also, knowing what the most common moves are in a specific situation will make it easier for you to determine what there is to read.
For these set patterns, there are books, programs and some databases available on the internet.