1. Main line 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6 Choose a line 1. Main line 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6 2. Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 3. Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted 1. Nf3 g6 2. d4 Bg7 3. e4 d6 4. c4 c5 5. dxc5 Qa5+ Close 1. Main line 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6 2. Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 3. Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted 1. Nf3 g6 2. d4 Bg7 3. e4 d6 4. c4 c5 5. dxc5 Qa5+ Next