A21English Opening
1.c4 e5 2.Nc3
A21English Opening
Troeger Defence
1.c4 e5 2.Nc3 d6 3.g3 Be6 4.Bg2 Nc6
A21English Opening
Keres Variation
1.c4 e5 2.Nc3 d6 3.g3 c6
A21English Opening
1.c4 e5 2.Nc3 d6 3.Nf3
A21English Opening
Smyslov Defence
1.c4 e5 2.Nc3 d6 3.Nf3 Bg4
A21English Opening
Kramnik-Shirov Counterattack
1.c4 e5 2.Nc3 Bb4