ECO D30
10 named openings and variations are classified as D30. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Queen's Gambit DeclinedD301. d4 d5 2. c4 e6
- Queen's Gambit Declined: Capablanca VariationD301. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5 h6
- Queen's Gambit Declined: Semmering VariationD301. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2 Nbd7 6. Bd3 c5
- Queen's Gambit Declined: Spielmann VariationD301. d4 d5 2. c4 e6 3. Nf3 Nf6 4. e3 c6 5. Nbd2 g6
- Queen's Gambit Declined: Stonewall VariationD301. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2 Ne4 6. Bd3 f5
- Queen's Gambit Declined: Tarrasch Defense, Pseudo-TarraschD301. d4 d5 2. c4 e6 3. Nf3 c5
- Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch Bishop AttackD301. d4 d5 2. c4 e6 3. Nf3 c5 4. cxd5 exd5 5. Bg5
- Queen's Gambit Declined: Traditional VariationD301. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5
- Queen's Gambit Declined: Vienna VariationD301. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5 Bb4+
- Semi-Slav Defense: Quiet VariationD301. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2