All ECO Codes
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E51
Nimzo-Indian Defence
4.e3 e8g8, 5.Nf3 d7d5
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5
E51
Nimzo-Indian Defence
4.e3, Ragozin Variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 Nc6 7.O-O dxc4