(A21) Vienna

1. c4 e5 2. Nc3 Bb4
0/100 games played
(A21) Keres

1. c4 e5 2. Nc3 d6 3. g3 c6
0/100 games played
(A21) Smyslov

1. c4 e5 2. Nc3 d6 3. Nf3 Bg4
0/100 games played