My current strategy is this (mind I do have knowlegde, it just needs expanding) Whenever I play a game, I check afterwards from the point where the preparation (and my knowledge) ended what I should have played, and if it's in line with theory.

  - If the move I played is in line with theory, I don't bother trying to remember it because I can find it. 
  - If there are more than 1 plausible move in theory and my move is one of them, don't bother because I can find it.
  - If theory happens to be something I can't find on my own, then I investigate the idea behind it and automagically I remember (at least for some time)