A42 — Modern Defense: Averbakh System
Flank & English openings (A00–A99)
1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4
Full page: Modern Defense: Averbakh System →ECO A42 covers Modern Defense: Averbakh System and related lines (Modern Defense: Averbakh System, Modern Defense: Kotov Variation, Modern Defense: Randspringer Variation, Modern Defense: Averbakh Variation, Pseudo-Sämisch). Main line 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 with variations, statistics, and the best responses.
6 lines under A42
Modern Defense: Averbakh System
1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4
Modern Defense: Kotov Variation
1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 Nc6
Modern Defense: Randspringer Variation
1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 f5
Modern Defense: Averbakh Variation, Pseudo-Sämisch
1. d4 g6 2. c4 Bg7 3. e4 d6 4. Be3 Nf6 5. f3
Pterodactyl Defense
1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 5. Nc3 d6
Pterodactyl Defense: Central, Bogolubovia
1. d4 g6 2. c4 Bg7 3. e4 d6 4. Nc3 c5 5. Nge2 Qa5