[November 07, 2017] Updated Opening Line by GM Aleksandar Kovačević:
Nimzo-Indian Defense, Classical Variation with 4… O-O 5. a3 (incl. Vitolinsh-Adorjan Gambit)

[Line 181 : 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3]

After the forced 5… Bxc3+ 6. Qxc3 various sidelines for Black are covered in Line 181.

Vitolinsh-Adorjan Gambit 5… b5 is an interesting try at complications, and probably the best plan for White it is to return the Pawn with 6. cxb5 c6 7. Bg5 cxb5 8. e3. Our assessment is that after precise play White should secure some opening advantage.

As the main line we have examined 6… d6, with the idea to play Re8, followed by Qe7 and e6-e5; we think that Black ought to get quite decent positions in this line.

[Diagram: Black to Move] C. Bogner – A. Naiditsch, Germany 2011. Naiditsch missed the best way to fight for the compensation. White is behind in development, so Black should seek to open lines for his Rooks and find a way to bring his Bishop into play.

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