This is the first book I purchased from the famed Yusupov 9-book training course, with the intention of purchasing potentially the entire course over the long term. The plan is to spend about 3 months per each book, as I am a working adult and don't have the time to spend more than a few hours each week studying chess. I have gone over a quarter of the book so far and while this is a solid training book, there are a few caveats to consider, as per below:
1. Firstly, this is 100% not a beginner's book, unless you are supremely talented, a genius or Beth Harmon when it comes to chess. This isn't even really for most intermediate players who fool around on chess.com or other websites playing casual games. Material in this book would be tough for most intermediates, and some of it would even challenge the more advanced players (my blitz rating on chess.com is top 10%, bullet rating top 20% and my puzzle training rating 2400+).
And remember, this is the first orange book, which is the easiest level in the 9 book course (Orange --> Blue --> Green).
2. Yusupov's books are known for their brevity, concision and precision. Don't expect long, or even of moderate length, verbal explanations. Definitely look elsewhere for that. There are 24 chapters and each chapter focuses on some particular theme (e.g. checkmates in 3, value of pieces, pawn structure, etc.). The chapter is introduced with several examples from actual games (as opposed to artificial composed & unrealistic studies), very brief verbal explanation is provided as to the goals of the exercises, and then a solution is given, along with relevant variations.
The first example or two in any given chapter are fairly easy and straight forward, but increase in difficulty very rapidly. At the end of each chapter, there are 12 exercises ranging from 1-3 stars - corresponding to the difficulty level of the puzzle. You are to consider each example, and your answer must consist of a series of moves (usually 1-3, but sometimes more), including considering the various alternative moves from the opponent. Ideally, you have to figure everything out in your head using a real chessboard or a computer screen, but without moving pieces to aid you (that's how I approach it). And you score 1-3 points on any given puzzle. For example, if the puzzle is denoted by 2 stars, you can receive up to 2 points on it, depending on whether you get all your own moves correct.
3. Finally, and this is the only critical comment upon the book, some exercises don't seem to correspond very well to the theme of the chapter studied. For example, one chapter was about the value of the pieces, i.e. in some positions the relative strength of the rook may be less than that a of a knight or bishop. However, when provided exercise examples, it really was all about tactical vision and calculation, rather than conceptual understanding. One would think that when discussing the value of the pieces, the focus would be geared toward explaining how to secure long term strategic and positional advantages, rather than how to enact a 3-4 move tactical combo that ends in a blow to the opponent.
Considering that I have reviewed only 6/24 chapters, maybe I am wrong about the rest of the book. If so, I will update my review and increase my rating to 5 stars.
Finally, you should take 1-2 hours studying each chapter (inclusive of doing the exercises) to really obtain some useful knowledge from the book. If you just skim it, and don't consider variations, then it will be fruitless and a waste of time.
Highly recommended.