Grünfeld Defense: Three Knights Variation

The Grünfeld Defense: Three Knights Variation is a chess opening classified under ECO code D90 in the Closed & Semi-Closed Games family, arising from 1.d4 d5, including the Queen's Gambit, Slav Defense, and related systems. It is reached after 4 moves: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3. The resulting position leaves black to move.