Chess Opening Theory/1. e4/1...Nf6/2. e5/2...Nd5/3. d4/3...d6/4. c4/4...Nb6/5. exd6/5...exd6/6. Nc3


 * 6...Be7
 * 6...Bf5
 * 6...Nc6
 * 6...g6