ECO D98
2 named openings and variations are classified as D98. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Grünfeld Defense: Russian Variation, Keres VariationD981. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 8. Be3 Nfd7 9. Be2 Nb6 10. Qd3 Nc6 11. O-O-O
- Grünfeld Defense: Russian Variation, Smyslov VariationD981. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4