Why is semantic processing so effective for memory retrieval? Can you think of a few examples that prove this effect?

It seems that semantic processing results in a more elaborative encoding so that the new memory trace becomes embedded in a rich network of other traces making it more accessible for various retrieval cues. To chess masters, a meaningful chessboard was better recalled than a completely random one. Indicating that processing material one is to memorize makes it much easier to retrieve correct information. (Chase, W. G 1973) Also; self-generated cues resulted in a much higher recall rate than cues generated by others when trying to remember a target word.