Stefan Sergiev was the first doctor of pedagogical sciences in Bulgaria in the field of chess. Since 1975 he has been a member of the Bureau of BF Shahmat. He was Deputy Chairman and Chairman of the Federation. International Master of correspondent chess, Republican Champion for 1972-1974. He was author of more than 60 books on chess themes. Part is extremely well structured. Walk from the simpler to the more complex. Examples are clear and understandable.The main technical methods as well as the strategic accents are presented in an accessible language.Very good hit is the inclusion of world champions and elite grandmasters developed over the years chess theory.A The most valuable part of this guide is that most examples are from the works of Bulgarian chess players. 
