Neo-Grünfeld Defense: Classical Variation, Original Defense

The Neo-Grünfeld Defense: Classical Variation, Original Defense is a chess opening classified under ECO code D78 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 6 moves: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 c6 6. O-O d5. The resulting position leaves white to move.