Hansen: Nimzo-Indian 4.e3 - Gambit VerlagEver since Nimzowitsch introduced his flexible, dynamic defence to the queen\''s pawn, debate has raged over White\''s best reply. Many variations have been in and out of fashion, but one line in particular has proved an enduring weapon the sound and solid 4 e3 line, known as the Rubinstein Variation. The 4 e3 Nimzo is extraordinarily rich in strategy. All manner of different central pawn structures can arise, such as the blocked centre characteristic