Ruy Lopez · if they play 3...Nf6
C67 · Ruy Lopez: Berlin Defense, Rio Gambit Accepted · you play White
This is the branch for when your opponent leaves the Ruy Lopez main line with 3...Nf6.
The idea
Castle and let Black take e4: the rook on e1 wins the pawn back and your pieces come out first.
The moves
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. Re1 Nd6 6. Nxe5 Be7 7. Bf1 Nxe5 8. Rxe5 O-O
Free, no sign-up. The board plays the other side and you play every one of your moves. A line you miss comes back tomorrow; one you get comes back after 3 days, then a week, then three weeks.
Opening names from the Lichess chess-openings list (CC0). Every line was checked move by move by the rules engine. Part of Chess Path, a free chess course.