D21: Queen's Gambit Accepted, 3.Nf3

D21 Sub-variants:

• Queen's Gambit Accepted, 3.Nf3
  1. d4 d5 2. c4 dxc4 3. Nf3
• Queen's Gambit Accepted, Ericson variation
  1. d4 d5 2. c4 dxc4 3. Nf3 b5
• Queen's Gambit Accepted, Alekhine defense, Borisenko-Furman variation
  1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e4