Variations
Modern Defense: Dunworthy Variation
3. c4 d5 4. exd5 c6 5. dxc6 Bxd4
Modern Defense: Geller's System
3. Nf3 d6 4. c3
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Declined
3. c4 c5 4. Nf3 d6 5. Be2 Qa5+
Pterodactyl Defense: Central, Anhanguera
3. c4 c5 4. Nc3 d6 5. Be3 Qa5
Pterodactyl Defense: Central, Benoni Quetzalcoatlus
3. c4 c5 4. d5 d6 5. Nc3 Qa5
Pterodactyl Defense: Central, Quetzalcoatlus Gambit
3. c4 c5 4. Nc3 d6 5. dxc5 Qa5
Pterodactyl Defense: Fianchetto, King Pterodactyl
3. g3 c5 4. Nf3 Qa5+
Pterodactyl Defense: Fianchetto, Rhamphorhynchus
3. g3 c5 4. dxc5 Qa5+
Pterodactyl Defense: Western, Anhanguera
3. Nf3 c5 4. Be3 Qa5+