This book is a co-work of two world-known Mathematics Olympiad Masters, Svetoslav Savchev from Bulgaria and Titu Andreescu from USA. Both are trainer/leader/problem committe member of the national/IMO team for many years, and are really excellent and famous in the olympiad field.
Reader may ask that what this thin book will give in an age with numerous contest problems and with new training books appearing every year. The answer is "the Insight". It is divided into 50 sections(topics), each section is a essay containing the analyzing several(3 to 6) related problems, usuall from easier to harder. These problems are carefully selected from the huge collection of problems in numerous mathematics magazines and contests.
This is the FIRST book in english to teach olympiad readers that how the problems are relating with each other, how a simple idea grows into a hard and beautiful problem, how to think in a higher point of view. However, the style of this book is rather relax and warm.
This is not a textbook nor a problem book, neither suitable for training owing to its form. It's for reading, appreciating, and for those teachers/students who have been familiar enough with the standard problems and tired of training sessions. If you want to know what a mathematical olympiad is, what a beautiful cute problem is, this book is for you.
This book is a pearl indeed. I really hope the authors will publish the volume 2,3,...