6.Ac4 d5 7.exd5 Ad6 8.0-0 ---> Gambito del arroz

                                         8...Axe5 9.Te1 De7 10.c3 Ch5

                                  8.d4 ---> Defensa Berlín

                                         8...Ch5 9.CC3 ---> variante Roma

                                                    9.0-0 ---> variante Schlechter

  6.Cxg4 Cxe4 7.d3 Cg3 8.Axf4 ---> variante Löwenthal

  6.d4 Ag7 ---> Defensa Paulsen

               7.Cxg4

               7.Ac4 d5 8.exd5 0-0 ---> Sistema Zukertort

                                       Ch5 ---> Sistema Leonhardt

                                             9.Cc3 0-0 ---> variante Spielmann

          6...d6 7.Cd3 Cxe4 8.Axf4 De7 ---> variante Philidor

                                                      9.De2

                                               8...Ag7 ---> variante Aronin

                                                          9.c3 0-0

                                                                 De7 10.De2 Af5 11.Cd2