Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Good Reference Book

This book works off the believe that you have some ideal about tactics and want to review. It increased my rating from 1400 to 1600 (Internet Rating) but I knew nothing about tactics to begin with. Chess Tactics for the Tournament Player (Comprehensive Chess Course, Third Level) is geared more to teach you fundementals about tactics than this book. Once you have the basics down you can use this book as quick review.