I have been taking lessons and my coach and I have been discussing an important philosophy. In squash there are no winners, just open spaces.
If you accept that philosophy what does mean to the game? Well very simply it means that your opponent can get to your next shot so the best you can do is make him work for it. Hit to somewhere he is not to do that. Get him running the diagonal. Take satisfaction from making your opponent really struggle to get your shots. He will likely get them all in the beginning but typically later in the match he will start to make more errors as you wear him down physically.