1. g1f3  1... d7d5  2. g2g3  2... g8f6  3. f1g2  3... c7c6  4. c2c4  4... d5c4  5. e1g1  5... e7e6  6. a2a4 White follows a plan to regain the pawn on c4. It's also possible to sacrifice it. 6... b8d7  7. d1c2  7... e6e5 An interesting and aggressive plan, trying to exploit the queen's positioning on c4.