Chess puzzle (Advantage)
Moves: 1. c4 d5 2. cxd5 Qxd5 3. Nc3 Qd8 4. d4 Nc6 5. Nf3 e6 6. e4 Bb4 7. a3 Bxc3+ 8.
bxc3 Nf6 9. Bd3 O-O 10. e5 Nd5 11. c4 Nc3 12. Qc2 Nxd4 13. Qxc3 Nxf3+ 14. gxf3
b6 15. O-O Bb7 16. Be2 Qh4 17. Qe3 f5 18. Qf4 Qe7 19. Qg5 Qc5 20. Be3 Qxe5 21.
Qg3 *
Position (FEN): r4rk1/pbp3pp/1p2p3/4qp2/2P5/P3BPQ1/4BP1P/R4RK1 b - - 1 21
Black to move.
Themes:  Middlegame  
Puzzle rating: 1457
Best move: f4