ECO C69 · Ruy Lopez
Ruy Lopez: Exchange Variation, Normal Variation
The position after 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O.
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O
Ruy Lopez: Exchange Variation, Normal Variation is filed under ECO C69, a variation of Ruy Lopez: Exchange Variation. It is the position after 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O — 9 half-moves in, with Black to move. From here theory names 3 continuations: f6, Bd6, Qd6.