E10: Blumenfeld counter-gambit accepted

E10 Sub-variants:

• Queen's pawn game
  1. d4 Nf6 2. c4 e6 3. Nf3
• Blumenfeld counter-gambit
  1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5
• Blumenfeld counter-gambit accepted
  1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. dxe6 fxe6 6. cxb5 d5
• Blumenfeld counter-gambit, Dus-Chotimursky variation
  1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5
• Blumenfeld counter-gambit, Spielmann variation
  1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5 exd5 6. cxd5 h6
• Dzindzikhashvili defence
  1. d4 Nf6 2. c4 e6 3. Nf3 a6
• Doery defence
  1. d4 Nf6 2. c4 e6 3. Nf3 Ne4