A42: Modern Defense

• Modern Defense: Averbakh System
  1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4
• Modern Defense: Averbakh Variation, Pseudo-Sämisch
  1. d4 g6 2. c4 Bg7 3. e4 d6 4. Be3 Nf6 5. f3
• 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
• 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