Chess puzzle (Advantage)
Moves: 1. c4 Nf6 2. Nf3 g6 3. d4 Bg7 4. Nc3 O-O 5. Qc2 d6 6. e4 Nc6 7. h3 Nb4 8. Qb1
c6 9. a3 Na6 10. Bd3 b5 11. cxb5 cxb5 12. O-O b4 13. axb4 Nxb4 14. Be2 Bb7 15.
Rd1 e6 16. b3 d5 17. e5 Ne4 18. Nxe4 dxe4 19. Bg5 Qb6 20. Be7 *
Position (FEN): r4rk1/pb2Bpbp/1q2p1p1/4P3/1n1Pp3/1P3N1P/4BPP1/RQ1R2K1 b - - 3 20
Black to move.
Themes:  Middlegame  
Puzzle rating: 1197
Best move: exf3