ECO D78: Neo-Grünfeld Defense

ECO D78 is part of volume D — Closed & Semi-Closed Games. The Lichess chess-openings dataset files one named line under it. It is Neo-Grünfeld Defense: Classical Variation, Original Defense: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 c6 6. O-O d5.

That position has come up in 942,448 Lichess games between players rated 1600 to 2500: White won 49.9%, 7.9% were drawn and Black won 42.2%.