C62: Ruy Lopez, old Steinitz defence, Nimzovich attack

C62 Sub-variants:

• Ruy Lopez, old Steinitz defence
  1. e4 e5 2. Nf3 Nc6 3. Bb5 d6
• Ruy Lopez, old Steinitz defence, Nimzovich attack
  1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. Bxc6
• Ruy Lopez, old Steinitz defence, semi-Duras variation
  1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. c4