D91
Grunfeld Defense: Three Knights Variation, Petrosian System
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5
The Grunfeld Defense: Three Knights Variation, Petrosian System is a chess opening classified under ECO code D91. It is reached after the moves 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5.
It belongs to the Grunfeld Defense family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.
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