Support the central knight and castle: Petrov Defense line

Repeat the pawn exchange. Support your central knight, develop your bishop and castle.

1. e4
2. e5
3. Nf3
4. Nf6
5. Nxe5
6. d6
7. Nf3
8. Nxe4
9. d4
10. d5
11. Bd3
12. Bd6
13. O-O
14. O-O