When I was a kid I liked to play openings like the Benkö, Budapest... But when I faced stronger opponents I got crushed in every (side)line. It seemed that I didn´t have a clue what was going on.
So at a bright moment I bought "Andrew Soltis - Black Defensive System For The Rest Of Your Chess Career". It involves a system, c6 and d5 against every possible line. Slav against d4, Caro Kann Nd7 variation, solid lines against the English, Bird, BDG etc...
It gave me equal positions, because I knew what was going on on the board. I found out that I could beat people of my own strength because I knew what to play in the early middlegames. And after some time when my technique improved I could keep up with stronger players.
In the meantime I bought "Soltis - Winning with 1 c4, a complete opening system", which usually gave me a slight advantage. (You can find them in ebook format on the internet if you want to have a look, just google it)
So my theory is: play what you UNDERSTAND, don´t be affraid to get an equal position, rely on your technique and you should improve quickly.
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Hey SchachMatt
Thanks for the book recommendations, you've got me googling these books now.
Are you sure that Chris Ward's book - "Play the Queen's Gambit" is a repertoire book for Black? From my googling it looks like a repertoire book for White.
That is most definitely a book for white. I've got it on my shelf.
Thanks for letting me know.