Related Openings
KGA - Schallop defense	e4, e5, f4, exf4, Nf3, Nf6
KGA - Becker defense	e4, e5, f4, exf4, Nf3, h6
KGA - Gianutio counter-gambit	e4, e5, f4, exf4, Nf3, f5
KGA - Bonsch-Osmolovsky Variation	e4, e5, f4, exf4, Nf3, Ne7