ECO C42 · Petrov's Defense
Petrov's Defense: Classical Attack, Jaenisch Variation
The position after 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.c4.
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4
Petrov's Defense: Classical Attack, Jaenisch Variation is filed under ECO C42, a variation of Petrov's Defense: Classical Attack. It is the position after 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.c4 — 15 half-moves in, with Black to move. Named theory ends here; beyond this the position is yours to work out.