1. e2e4  1... c7c6  2. g1f3  2... d7d5  3. d2d3 Curiously, this timid-looking system is often played by aggressive chess players. 3... d8c7  4. b1c3  4... d5e4  5. d3e4  5... b8d7  6. a2a4  6... g8f6 