Bulgaria is a country with long traditions in mathematical competitions. There are numerous regional competitions connected with important dates in Christian calendar or in Bulgarian history. These competitions range in format and difficulty and give opportunity to all students in lower and secondary school to test their abilities in problem solving. Great many of them being fascinated by problem solving in such competitions start working hard in order to acquire new knowledge in mathematics.

The most important and prestigious national competitions in Bulgaria are Winter Mathematical Competitions, Spring Mathematical Competitions and National Olympiad. The organization of these competitions is responsibility of the Ministry of Education and Science, the Union of Bulgarian Mathematicians and the local organizers. The problems for the competitions are prepared by so called Team of extra curricula research - a specialized body of the Union of Bulgarian Mathematicians.

This book contains all problems for grades 8 to 12 from the above mentioned national competitions in the period 2003-2006. The problems from all selection tests for BMO and IMO are also included. Most of the problems are regarded as difficult IMO type problems. The book is intended for undergraduates, high school students and teachers who are interested in olympiad mathematics.

2003
Winter Mathematical Competition
Spring Mathematical Competition
Regional Round of the National Olympiad
National Round of the National Olympiad
Team selection test for BMO
Team selection test for IMO

2004
Winter Mathematical Competition
Spring Mathematical Competition
Regional Round of the National Olympiad
National Round of the National Olympiad
Team selection test for BMO
Team selection test for IMO

2005
Winter Mathematical Competition
Spring Mathematical Competition
Regional Round of the National Olympiad
National Round of the National Olympiad
Team selection test for BMO
Team selection test for IMO

2006
Winter Mathematical Competition
Spring Mathematical Competition
Regional Round of the National Olympiad
National Round of the National Olympiad
Team selection test for BMO
Team selection test for IMO

Classification of the problems
List of notations