Chess puzzle (Advantage)
Opening: Benko_Gambit_Accepted, Benko_Gambit_Accepted_Fully_Accepted_Variation
Moves: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. Qa4+ Nbd7 8.
Qc6 g6 9. Nb5 Bxb5 10. Qxb5 Nxd5 11. Nf3 Nf6 12. e3 Bg7 13. Bc4 O-O 14. O-O Qc7
15. Qb3 Rfb8 16. Bxf7+ Kf8 17. Qe6 Rb6 18. Ng5 Bh6 19. Qxf6 *
Position (FEN): r4k2/2qnpB1p/1r1p1Qpb/2p3N1/8/4P3/PP3PPP/R1B2RK1 b - - 0 19
Black to move.
Themes: Hanging Piece, Trapped Piece Middlegame  
Puzzle rating: 1560
Best move: Nxf6