D27: Queen's Gambit Accepted, classical, Geller variation

D27 Sub-variants:

• Queen's Gambit Accepted, classical, 6...a6
  1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6
• Queen's Gambit Accepted, classical, Rubinstein variation
  1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. a4
• Queen's Gambit Accepted, classical, Geller variation
  1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. e4