opening
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Is it important to learn opening and at which level of your game it become important
very important. white has more freedom but you need to know how to combat white's opening moves! good game in the tournament buddy. To start at least get a couple things you like to play against 1.e4 and 1.d4
"If you want to play chess competitively, then you must develop an opening repertoire." - GM Patrick Wolff (1997)
One possible place to start is with the book, Discovering Chess Openings by GM John Emms.
https://web.archive.org/web/20140627114655/http://www.chesscafe.com/text/hansen91.pdf