(another personal favourite)" A combination composed of a sacrifice has more immediate effect upon the person playing over the game in which it occurs than another combination, because the apparent senselessness of the sacrifice is convincing proof of the design of the player offering it.
Quotes
"A discussion between the top management of the firm Audi and grandmasters Darga, Schmid and Pfleger dealt with the similarities and differences between chess-oriented thinking and the thinking processes required in business, and in particular whether one can benefit from the other. The question arose as to how a chess master actually discovers his moves. Dr. Pfleger was of the opinion that in the last analysis nobody fully knows the reasoning by which he arrives at a certain move. |
PFLEGER and TREPPNER, Chess: the mechanics of the mind |