Looking at the Nimzo-Indian Defence

The Nimzo-Indian defence is one of the more popularized openings believed to have originated in a match between Englisch vs. Blackburne, (source: chessgames.com). It is characterized by the moves 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4.

It was also played in the Spassky vs. Fischer game #1:

It is generally considered to put black on the offensive position and white on the defensive position through the start of the game.