A21 — English Opening: King's English Variation, Reversed Sicilian

ECO A21 covers English Opening: King's English Variation, Reversed Sicilian and related lines (English Opening: King's English Variation, Reversed Sicilian, English Opening: King's English Variation, Kramnik-Shirov Counterattack, English Opening: King's English Variation, English Opening: King's English Variation, Keres Defense). Main line 1. c4 e5 2. Nc3 with variations, statistics, and the best responses.