ECO C65 · Ruy Lopez
Ruy Lopez: Classical Variation, Zukertort Gambit
The position after 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Bc5 5.c3.
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5 5. c3
Ruy Lopez: Classical Variation, Zukertort Gambit is filed under ECO C65, a variation of Ruy Lopez: Classical Variation. It is the position after 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Bc5 5.c3 — 9 half-moves in, with Black to move. Named theory ends here; beyond this the position is yours to work out.