All ECO Codes
\
C61
Ruy Lopez
Bird's Defence
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4
C61
Ruy Lopez
Bird's Defence, Paulsen Variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4 4.Nxd4 exd4 5.O-O Ne7