Grünfeld Defense: Three Knights Variation, Petrosian System

1.
1. d4
2. Nf6
2.
3. c4
4. g6
3.
5. Nc3
6. d5
4.
7. Nf3
8. Bg7
5.
9. Bg5

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The Grünfeld Defense: Three Knights Variation, Petrosian System is a chess opening classified under ECO code D91 (Closed & Semi-Closed games). It is a variation of the Grünfeld Defense family. Step through the moves on the board above, then play the line yourself or review it with the built-in engine.