Best response to the Queen's Indian Defense: Kasparov-Petrosian Variation, Marco Defense (E12)

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 Be7 · White to move

What is the best response to the Queen's Indian Defense: Kasparov-Petrosian Variation, Marco Defense (1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 Be7)? White to move. See the top replies ranked by opening theory and real-game results.

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