Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Be2 Bc5 5. O-O d6 6. Na4 Nxe4 7. Nxc5 Nxc5 8.
d4 Nxd4 9. Nxd4 exd4 10. Qxd4 Ne6 11. Qc3 O-O 12. b3 c5 13. Bb2 f6 14. Rad1 Re8
15. Bc4 Kh8 16. Rfe1 Nf4 17. Qg3 Rxe1+ 18. Rxe1 Ng6 19. Bf7 Ne5 20. Bd5 Qa5 *
Position (FEN): r1b4k/pp4pp/3p1p2/q1pBn3/8/1P4Q1/PBP2PPP/4R1K1 w - - 5 21
White to move.
Themes:  Middlegame  
Puzzle rating: 1879
Best move: f4