Related Openings
Modern defense - Averbakh system, Randspringer Variation	d4, d6, c4, g6, Nc3, Bg7, e4, f5
Pterodactyl defense	d4, d6, c4, g6, Nc3, Bg7, e4, c5, Nf3, Qa5
Modern defense - Averbakh system	d4, d6, c4, g6, Nc3, Bg7, e4