کتاب Practical Chess Exercises: 600 Lessons from Tactics to Strategy

"In creating Practical Chess Exercises, Ray Cheng has turned a labor of love into a treasury of instructive problems to help non-beginners improve their chess. The problems are of all types—tactical and positional—and all levels. Best of all, they are not labeled in any way other than who is to move, so for each position you have to find the relevant concerns and properly address them. The answers are not just a list of moves, but they also include instructive prose. This book answers the prayers of chess enthusiasts looking for unmarked problems to test their skills."
—Dan Heisman, U.S. National Master, author of the award-winning Novice Nook column at Chess Café and books such as A Parent's Guide to Chess, Looking for Trouble, and Everyone's 2nd Chess Book