(A22) Bellon
1. c4 e5 2. Nc3 Nf6 3. Nf3 e4 4. Ng5 b5
(A22) Carls
1. c4 e5 2. Nc3 Nf6 3. g3
(A22) Carls (Dragón reverso)
1. c4 e5 2. Nc3 Nf6 3. g3 d5
(A22) Carls (Smyslov)
1. c4 e5 2. Nc3 Nf6 3. g3 Bb4