Hansen: Nimzo-Indian 4.e3 - Gambit Verlag improvers but because they have learned

but because they have learned the techniques needed to do it

Does this sound familiar

5 Four Knights Variation 106

Vasily Smyslov (1957 to 1958) – In contrast to Botvinnik

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Hansen: Nimzo-Indian 4.e3 - Gambit Verlag improvers but because they have learnedEver 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 of