ECO C71 · Ruy Lopez
Ruy Lopez: Morphy Defense, Modern Steinitz Defense
The position after 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6.
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6
Ruy Lopez: Morphy Defense, Modern Steinitz Defense is filed under ECO C71, a variation of Ruy Lopez: Morphy Defense. It is the position after 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 — 8 half-moves in, with White to move. Named theory ends here; beyond this the position is yours to work out.