Openings

Nimzo-Indian Defense: Spielmann, Romanovsky, Karlsbad Variation

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxd2
Top Players