Probably best read by players with ratings between 1000 and 1800. Great, concise, easy-to-understand explanations on a variety of topics. Based on the title, I was expecting a deeper discussion of middlegame strategy with game examples, but the book is really a quick look at the whole game, including openings, tactics, middlegame ideas, endgames, and more. The section on openings gives the reader an idea of how to study and look at openings in general: with an eye toward middlegame plans. But don't expect it to explain all the moves or even cover most major lines. It's just a tour of some major ideas in the openings. The book is really a reference book (the topics are alphabetized within sections). Alone, it probably wouldn't improve your game: there are just simply too many topics with very short explanations and discussions. But couple it with other books, videos, and game play, and it can be quite valuable. The book probably could have been much more valuable by itself if it ended with a section of several full games, analysed, and illustrating the topics taught.