Four Knights Game: Spanish Variation, Double Spanish (C49)
Coups: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O
├── C49 - 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. Bxc6 - Four Knights Game: Spanish Variation, Nimzowitsch Variation (4)
└── C49 - 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 - Four Knights Game: Spanish Variation (2)