Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 a6 5. d4 Nf6 6. dxc5 Qe7 7. Bg5 Qxc5 8.
Bxf6 Qxc4 9. Bxg7 Rg8 10. Bxe5 Qxe4+ 11. Qe2 Qxe2+ 12. Kxe2 Nxe5 13. Nxe5 d6
14. Nc4 Rxg2 15. Ne3 Rg6 16. Nd2 Bd7 17. a4 O-O-O 18. b4 Re8 19. b5 axb5 20. a5
f5 21. Kd3 *
Position (FEN): 2k1r3/1ppb3p/3p2r1/Pp3p2/8/2PKN3/3N1P1P/R6R b - - 1 21
Black to move.
Themes:  Middlegame  
Puzzle rating: 1187
Best move: f4