The Classical Variation arises in the Nimzo-Indian after 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 (ECO E32). The queen goes to c2 in advance so that after the exchange on c3 she can recapture and avoid the doubled pawns.
White's idea is to keep the bishop pair and a healthy pawn structure, and with them a long-term positional edge. In exchange Black leads in development and fights for the centre with ...c5, ...d5 and ...e5.
4.Qc2 is one of the most popular and principled continuations against the Nimzo-Indian at the top level. A subtle strategic fight between two bishops and quick development.
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