1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. b1c3  3... g8f6  4. a2a3 One of the ways to fight in the Four Knights. 4... f8d6 Temporarily blocking the other bishop to finish the development. 5. f1c4  5... e8g8  6. e1g1  6... h7h6 