Bird's opening (A02)
f4
f4
| Bird From gambit (A02) e5 | d5 Bird's opening (A03) |
| Bird Hobbs gambit (A02) g5 | e5 Bird From gambit (A02) |
| Bird's opening (A03) d5 | f5 e4 fe Nc3 Nf6 g4 Bird's opening Swiss gambit (A02) |
| Bird's opening Swiss gambit (A02) f5 e4 fe Nc3 Nf6 g4 | g5 Bird Hobbs gambit (A02) |