E57 - Nimzo-Indian: 4.e3 O-O 5.Nf3 c5 6.Bd3 d5

Variation: Nimzo-Indian: 4.e3 O-O 5.Nf3 c5 6.Bd3 d5

Initial Move: Refinements of the d5 Nimzo. Both players engage in a slow maneuvering battle for control of the key central squares.