├── D20 - 1. d4 d5 2. c4 dxc4 - Queen's Gambit Accepted (6)
├── D21 - 1. d4 d5 2. c4 dxc4 3. Nf3 - Queen's Gambit Accepted: Normal Variation (0)
├── D22 - 1. d4 d5 2. c4 dxc4 3. Nf3 a6 - Queen's Gambit Accepted (0)
├── D23 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 - Queen's Gambit Accepted (0)
├── D24 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 - Queen's Gambit Accepted: Showalter Variation (0)
├── D24 - 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 - Queen's Gambit Accepted (7)
├── D25 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 - Queen's Gambit Accepted: Normal Variation (4)
├── D26 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 - Queen's Gambit Accepted: Normal Variation, Traditional System (12)
├── D27 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 - Queen's Gambit Accepted: Classical Defense, Main Line (6)
├── D28 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 - Queen's Gambit Accepted: Classical Defense, Alekhine System (0)
└── D29 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. Bb3 Bb7 - Queen's Gambit Accepted: Classical Defense, Alekhine System, Main Line (0)