Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Marshall_Attack
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3
d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. Bxd5 cxd5 13. d4 Bd6 14. Re3 Qh4
15. g3 Qh3 16. Qf1 Qh5 17. Bd2 f5 18. Qg2 *
Position (FEN): r1b2rk1/6pp/p2b4/1p1p1p1q/3P4/2P1R1P1/PP1B1PQP/RN4K1 b - - 1 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 1599
Best move: f4