This book is very useful for players who already know a little about the Grunfeld, but is perhaps not the best place to start if that isn't you. Jonathan Rowson's superb book 'Understanding the Grunfeld' is indisputably more instructive than Davies' effort, although they are both essential books for Grunfeld players; Davies takes a practical approach to the problem of finding time to have a life AND play this defence, which is necessarily theoretical in many lines, whilst he also serves up a picture of current theory that will prove useful to many intermediate/advanced practitioners. Rowson, on the other hand, provides a fuller introduction to the defence and the concepts that underpin it. Both books compliment each other perfectly, as Rowson is now (perhaps) out of date in a couple of lines, although he provides the foundation you'll need to make better sense of some of the chapters in Davies. Davies, for example, recommends 9...b6 in the 8.Rb1 Exchange line, thereby easing some of Black's need to learn sharp theory, although he also provides sufficient coverage for those who wish to play the mainline and grab the a2 pawn. He simply observes that it may be impractical for many players to go down these mainlines unless they are prepared for the day that White suddenly finds an unpleasant improvement..... similarly, he feels that the Prins variation against the Russian is a fine way to play IF you have time & inclination to learn the theory - if not, he provides coverage of alternatives he feels are adequate. In fact, his coverage of the Russian system takes in various Black responses, so there is much scope for experimentation. In this respect he gives you more than Rowson. In conclusion, I would say that anyone thinking about buying this (very good) book should also be buying the other one by Rowson, if they don't already own it. With both of them, you should find it's a lot easier to play against that 1.d4 move.....