| ECO | Moves | Opening | ||
| C47 | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 | Four knights, Scotch variation | ||
| C48 | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 | Four knights, Spanish variation | ||
| C49 | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 | Four knights, double Ruy Lopez |
| ECO | Moves | Opening | ||
| C47 | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 | Four knights, Scotch variation | ||
| C48 | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 | Four knights, Spanish variation | ||
| C49 | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 | Four knights, double Ruy Lopez |