ALAPIN C3 SICILIAN - 2…e5: The Main Line; Book #5/21 of Series is one of the published parts of the Alapin's Manual of Chess Learning, which consists of the 21st chess lecture Courses. The Manual and this book were created to correct the existing imbalance in chess education, and also for a significant increase in learning effectiveness of chess players or Chess Club’s students. All stages of the 60+ chess games are originally analyzed through the prism of only one opening - the ECO B22: Sicilian: 2 c3 - with generally accepted modern name of ALAPIN C3 SICILIAN; c3 Sicilian; c3 Alapin; or Alapin’s Variation of the Sicilian Defence opening in comparison with the numerous different openings in the majority of chess Manuals. In the description and analysis of all chess games, positions, moves, diagrams, puzzles, and exercises - simple, short, and understandable phrases were used. Long-move variations and options, as well as ornate-refined phrases are not given To such individuals, who can get the most out of our Book, it is possible to refer chess players and/or Chess Club’s students with Chess Rating ranging from 1200 and up to Chess Masters - Raiting from 2200 Elo. If chess players of the FM level and above find our Book useful for themselves, we will be sincerely glad.