Classic Ruy: Ruy Lopez (Spanish Opening) line

Engine-verified opening line.

1. e4
2. e5
3. Nf3
4. Nc6
5. Bb5
6. Nf6
7. O-O
8. d6
9. Re1
10. Bd7
11. c3
12. Be7
13. d4
14. exd4
15. cxd4
16. O-O
17. Nc3
18. a6
19. Ba4
20. b5
21. Bc2