Aperture

Bongcloud Attack
Scandinavian Defense
Duras Gambit
Smith-Morra Gambit
Sicilian Defense: Alapin Variation
Slav Defense
Stafford Gambit
Ponziani Opening
Benko Gambit
London System
French Defense
Caro-Kann Defense
Budapest Gambit
Elephant Gambit
Nimzo-Larsen Attack
Four Knights Game: Halloween Gambit
Orthoschnapp Gambit
Lucchini Gambit
Italian Game: Evans Gambit
English Opening