ECO D20
17 named openings and variations are classified as D20. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Queen's Gambit AcceptedD201. d4 d5 2. c4 dxc4
- Queen's Gambit Accepted: Accelerated Mannheim VariationD201. d4 d5 2. c4 dxc4 3. Qa4+
- Queen's Gambit Accepted: Central Variation, Alekhine SystemD201. d4 d5 2. c4 dxc4 3. e4 Nf6
- Queen's Gambit Accepted: Central Variation, Greco VariationD201. d4 d5 2. c4 dxc4 3. e4 b5
- Queen's Gambit Accepted: Central Variation, McDonnell DefenseD201. d4 d5 2. c4 dxc4 3. e4 e5
- Queen's Gambit Accepted: Central Variation, McDonnell Defense, Somov GambitD201. d4 d5 2. c4 dxc4 3. e4 e5 4. Bxc4
- Queen's Gambit Accepted: Central Variation, Modern DefenseD201. d4 d5 2. c4 dxc4 3. e4 Nc6
- Queen's Gambit Accepted: Central Variation, Rubinstein DefenseD201. d4 d5 2. c4 dxc4 3. e4 c5
- Queen's Gambit Accepted: Central Variation, Rubinstein Defense, Yefimov GambitD201. d4 d5 2. c4 dxc4 3. e4 c5 4. d5 b5
- Queen's Gambit Accepted: Linares VariationD201. d4 d5 2. c4 dxc4 3. e4 c5 4. d5 Nf6 5. Nc3 b5
- Queen's Gambit Accepted: Old VariationD201. d4 d5 2. c4 dxc4 3. e3
- Queen's Gambit Accepted: Old Variation, Billinger GambitD201. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. a3
- Queen's Gambit Accepted: Old Variation, Christensen GambitD201. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. Nf3
- Queen's Gambit Accepted: Old Variation, Korchnoi GambitD201. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. Kf1
- Queen's Gambit Accepted: Old Variation, Novikov GambitD201. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. Nd2
- Queen's Gambit Accepted: Saduleto VariationD201. d4 d5 2. c4 dxc4 3. e4
- Queen's Gambit Accepted: Schwartz DefenseD201. d4 d5 2. c4 dxc4 3. e4 f5