Related Openings
Nimzo-Indian - Simagin Variation	d4, Nf6, c4, e6, Nc3, Bb4, e3, O-O, Ne2, d5, a3, Bd6
Nimzo-Indian - 4.e3 O-O	d4, Nf6, c4, e6, Nc3, Bb4, e3, O-O