Note 18 — CHAP. II. General Maxims.
Reading edition
To change our exchange pieces is to lose one or two of your own for the sake of taking one or two of the adversary’s. It serves to clear the board, and enlarge the scene of action; and, when you get a piece of greater value than that lost, it encreases your comparative strength. Nevertheless it is only to be done with caution, and of those pieces for which you have the least occasion.