2016-02-18 - Update Line 159[September 29, 2017] Updated Opening Line by GM Slaviša Brenjo:
King’s Indian Defense, Petrosian Variation (incl. Stein Defense)

[Line 159 : 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 without 7. Be3, 7. O-O]

Variation named after 9th World Champion Tigran Petrosian starts with 7. d5, where the most popular choice for Black remains 7… a5, explored many years ago by another famous Soviet chess player – Leonid Stein. This highly complex strategical line was very popular during the 1959 Candidates tournament, played twice in the games between Tal and Fischer, and also in two other games: Petrosian – Gligorić and Olafsson – Gligorić. Even nowadays it can sometimes be seen in top-level encounters, e. g. like in Kramnik – Nakamura, London 2014.

Apart from the Petrosian Variation, Exchange Variation is also covered in this line, as well as some rare sidelines on White’s 7th move.

[Diagram: White to Move] This double-edged position is in White’s favor, mostly because of the open g-file for his rooks. It’s White’s move, and he has a great opportunity to launch a decisive attack!

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