[August 11, 2018] Updated Opening Line by Bojan Vučković:
Queen’s Indian Defense, Petrosian Variation – Farago Defense (incl. Hedgehog Variation)

[Line 207 : 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Ba6 5. Qc2]

After directing the white Queen to c2, Black usually goes back with his light-squared Bishop 5… Bb7 (Farago Defense) and then plays c7-c5, making use of the fact that now White can no longer push his pawn to d5. As a consequence, when Black captures with the pawn on d4, a Hedgehog setup arises.

The most common follow up begins with 5… Bb7 6. Nc3 c5 7. e4 cxd4 8. Nxd4. Now in case of 8… Bc5 White gets a small edge after 9. Nb3 Nc6 10. Nxc5 bxc5 11. Be3. Move 8… Nc6 seems to be the best option for Black, and after 9. Nxc6 Bxc6 White’s logical continuation is 10. Bf4 followed by either Rd1 or O-O-O, controling a little bit more space then the opponent. Black often opts for 10… Bc5, then proceeds with O-O, a7-a5 and e7-e5, deploying his pieces on the Black squares.

[Diagram: Black to Move] W. Schmidt – S. Marjanović, Vrnjačka Banja 1983. White has made a typical sacrifice of d-pawn, counting on the e4-b7 pin. Still, there is an oversight in his calcutation that allows Black to obtain a better position!

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