ECO D63
5 named openings and variations are classified as D63. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Queen's Gambit Declined: Orthodox Defense, Capablanca VariationD631. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 b6 8. cxd5 exd5 9. Bb5
- Queen's Gambit Declined: Orthodox Defense, Henneberger VariationD631. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6
- Queen's Gambit Declined: Orthodox Defense, Main LineD631. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1
- Queen's Gambit Declined: Orthodox Defense, Pillsbury VariationD631. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 b6 8. cxd5 exd5 9. Bd3
- Queen's Gambit Declined: Orthodox Defense, Swiss, Carlsbad VariationD631. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6 8. cxd5