All ECO Codes
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E21
Nimzo-Indian Defence
three Knights Variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3
E21
Nimzo-Indian Defence
three Knights, Korchnoi Variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5
E21
Nimzo-Indian Defence
three Knights, Euwe Variation
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5 Ne4