 Ruy Lopez's disagreement with Damiano regarding the merits of 2...Nc6 led to 3.Bb5 (after 1.e4 e5 2.Nf3 Nc6) being named for him as the Ruy Lopez or "Spanish Opening".Opening theory was studied more scientifically from the 1840s on, and many opening variations were discovered and named in this period and later.Opening nomenclature developed haphazardly, and most names are historical accidents not based on systematic principles.