(Tests for advanced chess players. Boost your rating!). The book is intended for advanced players. The authors submit complicated positions. The readers, after the analysis, have to determine the next moves, for which they are scored. The book includes positions from both the middle game and the endgames. GM Sarchan and IM Logman Gulievs are brothers - both are strong chess players and they also work as trainers for a long time. Series Sekrety shakhmat.