E51 - Nimzo-Indian: 4.e3 O-O 5.Nf3 d5

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

Initial Move: The Nimzo-Indian with 5.Nf3. White develops naturally to maintain the balance and keep all options open for the middle-game. Learn this opening step by step