How to combine Basic Strategies to a winning-system Suppose one want to have a strategy so one can win over a "normal/average" chess-player. I was thinking that there was a set of strategies which could be combined so that  one could memorize it? Say the opening and the middle game. Then one could always win over a "non experienced" chess-player.
That's not how chess works.

Chess has too many possibilities for a "one size fits all"-strategy or set of strategies that you could learn by heart. 

At the risk of repeating myself: Learning chess is like learning a language. It's kind of hard to learn a set of sentences that allow you to win any debate against an average debater.

Instead, "understanding" is the key. Languages and chess have to be learnt the hard way: Maybe some rote learning can be beneficial, but mostly you'll need lots of practice and exposure to "good chess"/correct language until you have developed an intuition about sentence structures/connotations/positions/tactics etc.