The "Reassess Your Chess Workbook: How to Master Chess Imbalances" is a comprehensive guide written by international chess master Jeremy Silman. This workbook contains 131 carefully selected problems designed to test players' strengths and weaknesses. The exercises cover all phases of the chess game, including openings, middlegame, and endgame. It is suitable for both beginners and advanced players and can be used independently or in conjunction with Silman's earlier work "How to Reassess Your Chess." The clear illustrations and structured approach make it a valuable tool for anyone looking to improve their chess skills.