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Colle System: Rhamphorhynchus Variation
2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+
Modern Defense: Semi-Averbakh Variation, Polish Variation
2. c4 g6 3. d4 Bg7 4. e4 Qb6
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation
2. c4 g6 3. d4 Bg7 4. e4 Qa5+
Zukertort Opening: Speelsmet Gambit
2. d4 cxd4 3. e3