A Fide master said that he knew only 20 patterns of the 32 checkmate patterns. What does this tell us? It is not the amount of patterns that counts. What is important, is the frequency of occurrence of the patterns you know and how deep your familiarity with the pattern is.
I noticed that I'm not familiar enough with the phantom auras of the pieces. That is to say, the virtual future influence of the pieces. This observation arose from studying checkmate puzzles. Where you chase a king with the phantom auras of the pieces into a killbox and squeeze it.
Now I'm focusing on other puzzles I have trouble with, and I notice that there are other phantom patterns I have trouble with. Take for instance this diagram:
|White to move|
3R4/p5r1/4q1k1/4p3/6n1/4NQ2/PPP5/6K1 w - - 0 1
In order to find out why these positions cause me trouble, I ask myself: "what should I ask myself here in order to trigger the right pattern?"
Well, I don't know yet, but the pattern I'm missing is a phantom fork. With targets that are not in place yet.