C64: Ruy Lopez, classical defence, 4.c3

C64 Sub-variants:

• Ruy Lopez, classical (Cordel) defence
  1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5
• Ruy Lopez, classical defence, Zaitsev variation
  1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. O-O Nd4 5. b4
• Ruy Lopez, classical defence, 4.c3
  1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3
• Ruy Lopez, classical defence, Benelux variation
  1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Nf6 5. O-O O-O 6. d4 Bb6
• Ruy Lopez, classical defence, Charousek variation
  1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Bb6
• Ruy Lopez, classical defence, Boden variation
  1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Qe7
• Ruy Lopez, Cordel gambit
  1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 f5