(A25) Carls
1. c4 e5 2. Nc3 Nc6 3. g3
(A25) Taimanov
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7
(A25) Hort
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 d6 6. Nge2 Be6
(A25) Amsterdam
1. c4 e5 2. Nc3 Nc6 3. e3 Nf6 4. b3 d6