A review of FCO in amazon.com:
"This book is a miracle. It's fills a gap between more simple opening encyclopedia like Seirawan's "Winning chess openings", Collins "Understanding the chess openings" and specific opening books. This book is in fact a modern and a more advanced version of Ruben Fines "The ideas behind the chess openings". And lower rated chess players (below 1800) should understand the chess opening plans, rather than memorizing openings.
Many chess players (improvers and club players) have bought a book on a given opening, for later find that opening not suitable for them, a waste of money. So in the beginning of your chess career, you should instead buy only one book.
This book!
As an example, this book will probably give you the same introduction and plans in the Sicilian opening, as Emms "Starting Out-The Sicilian", "Fundamental chess openings" contains almost 60 pages with plans and information about the Sicilian opening. That's more than enough for player rated below 1800.
Strongly recommended!"
I like the book "The Ideas behind the chess openings" by Reuben Fine. The book explains the ideas and plans of the openings. Do you know any similar book?