When to Exchange in Chess
This book, written by the hugely popular chess writer Andrew Soltis, is the only one that will help you up your game. He explains if you should exchange your bishop for a knight, which pair of bishops to exchange, when it's important to keep rooks on the board, and when to refuse any trade.
Your Kingdom For My Horse
Every chess player needs to know how to handle pawns. Pawns form the 'playing fields' of chess games, a semi-permanent structure that can determine whether a player wins or loses. This fully updated version of a timeless chess classic will give you the comprehensive knowledge to mastering pawn structures.
Pawn Structure Chess