Chess puzzle (Advantage)
Moves: 1. a3 a6 2. b3 b5 3. Bb2 Bb7 4. d3 d5 5. f3 c5 6. e4 d4 7. Nd2 g6 8. Qe2 Bg7 9.
Qf2 e5 10. Ne2 Nf6 11. O-O-O Nc6 12. Kb1 b4 13. a4 Na5 14. f4 Ng4 15. Qf3 Ne3
16. Re1 exf4 17. Nxf4 O-O 18. h4 f5 19. Ne6 fxe4 20. Nxd8 *
Position (FEN): r2N1rk1/1b4bp/p5p1/n1p5/Pp1pp2P/1P1PnQ2/1BPN2P1/1K2RB1R b - - 0 20
Black to move.
Themes:  Middlegame  
Puzzle rating: 1782
Best move: exf3