(D33) Folkstone
1. d4 d5 2. c4 e6 4. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 c4
(D33) Rey Ardid
1. d4 d5 2. c4 e6 4. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 c4 7.e4
(D33) Prague
1. d4 d5 2. c4 e6 4. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6
(D33) Wagner
1. d4 d5 2. c4 e6 4. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7.Bg2 Bg4