The Moment of Zuke has the best instructional format - it is suited ideally for self-study as well as an for instructional Course on the Colle Zukertort (C-Z)opening specifically, or tactics generally (Coaches, please make note of it!).
The opening related material includes 1. When to advantageously transpose out of C-Z 2. Middle game plans when Black plays ...Ne4 3. When to play g4. 4. How to react when Black prepares ...f5?
The tactics related material includes over a hundred different positions that arise out of C-Z and C-K openings where the Classic Bishop sacrifice (1.Bxh7+!?) and Double bishop sacrifice on h7 and g7 possibilities are available.
The moment of Zuke contains 7 modules. Each module has a Lesson section, an Exercises section and a Solutions section. The lesson is delivered clearly, in a conversational language that beginners can understand. The exercises are very relevant to the lesson and a diligent student will benefit tremendously by spending time on each exercise. The solutions section is appropriate and correct - it contains either the tactical solution or a strategic explanation accompanied by the entire game to demonstrate the strategic ideas - this mix is very good.
The seven modules themselves are each an independent entity on their own. Perhaps the most accessible and fun module is the last one - Module Seven: The classic bishop sacrifice. David Rudel found 60 positions from real games to test us on this most fundamental of the sacrifices.
The module 4 contains the Double Bishop Sacrifice. The double bishop sacrifice used to be impossible for me to produce over the board. It always belonged to the realm of tactics that one solved online or found in a book - never in one's own game. But The Moment Of Zuke has changed that. It gives you specific conditions to look for: for instance, location of the Black queen, presence of Knight and Bishop on d7 and e7 squares, presence of a pawn on c5, etc. It gives you a checklist and the necessary ammunition to execute the idea. Even when you know all of this, and are looking at a won position, you won't be able to believe it is winning, unless you know one trick - a trick that I have seen mentioned only in The Moment Of Zuke - and that trick is to sacrifice your knight on e4 too at the right moment. All this sounds complicated, and it indeed is, but thanks to David Rudel, this mysterious combination has been broken down into its elements that even a beginner can recognize. There are 20 exercises presented for us to practice the double bishop sacrifice. After reading this book, when I was playing a tournament game, I was already calculating all sorts of combination move 8 onwards!
Module 3 addresses a subject that is of paramount importance to C-Z player that has not been illuminated by other authors at all - what to do when Black plays an early ...Ne4? David Rudel gives the reader a complete arsenal of tricks to try in such a situation by demonstrating all the problems for Black when ...Ne4 is played. Now I can really believe that ...Ne4 is a bad move.
Module 5 is about early middle game strategy when a key event happens towards the end of the opening - this key event is Black's Knight at f6 square retreats to either d7 or e8 to make way for f-pawn push. Again, a catalogue of readymade plans is presented along with the decision making algorithm. You can navigate the opening on autopilot, if you digest the material in this chapter.
Module 6 is about g4. When to make, when to avoid, what are the consequences, etc. It is a very advanced chapter but written very simply. If your chess strategy understanding is expert level or higher, then this chapter is a gem for you.
Module 2 is about some sister openings of C-Z and how to react differently to come out with an advantage. Moudle 1 is about move order in the opening. Both modules 1 and 2 are important for perfecting one's repertoire.
The modules are organized in the chronological order - 1. opening, 2. early deviation, 3.dealing with Ne4, 4.Double bishop sacrifice, 5.game changing moment, 6.deciding on g4 and to end it all with 7. Classic Bishop sacrifice.
Perhaps the best thing about buying a book from David Rudel is that there is "post sales support" - in that there is an online forum where you can discuss your ideas, clarify your doubts and share your games directly with the author!!! So, this is one book that I recommend to anyone who:
a. doesn't have any opening repertoire, but wants to pick one.
b. wants to improve tactics - not just in a text book but in a real game situation.
c. plays Colle/London/Trompowsky/Torre/Stonewall attack system already.
d. wants to learn C-Z:
Note that there are other books and DVDs on this opening, and I have read most of them that are available from amazon, but this is an original piece of work and represents a breakthrough in dissemination of Colle-Zukertort knowledge to the general audience.