4.Cc3

  4.d4 ---> Gambito Rosentreter

        4...h6 ---> Defensa Becker

        4...g4

  4.Ac4

        4...g4 ---> Gambito Muzio

        4...Ag7 ---> Defensa Neumann

                  5.d4 g4

                  5.h4 ---> Gambito Greco-Philidor

                         5...h6 6.d4 d6 7.hxg5

                                             7.Dd3 Cc6

                                             7.c3 Cc6 8.Db3 De7

                                                         8.0-0 De7

                                                                 Ag4

                                                                 Cf6

                  5.0-0 ---> Variante Hanstein - Fischer

  4.h4

        4...g4 5.Cg5 ---> Gambito Allgaier

                         5...Cf6

                         5...d5

                         5...h6 6.Cxf7 7.Rxf7 7.d4 d5

                                                    7.Ac4 d5 8.Axd5 Rg7

                  5.Ce5 ---> Gambito Kieseritzky

                          5...Cc6 ---> Defensa Viena

                          5...d5 ---> Defensa de Campbell

                          5...Ae7 ---> Defensa de Polerio

                          5...De7 ---> Defensa de Rosenthal

                          5...d6 ---> Defensa húngara

                                  6.Cxg4 Cf6

                          5...Ag7 ---> Defensa de Paulsen

                                    6.d4

                                    6.Cxg4

                          5...h5 ---> El azote largo

                                   6.Ac4 Ch6 7.d4 d6 8.Cd3 f3

                                            Th7 7. d4 d6 8.Cd3 f3 9.gxf3

                          5...Cf6 ---> Defensa Berlín