Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. Nc3 Bd6 6. d4 exd4 7. Qxd4 f6 8.
Be3 Ne7 9. e5 fxe5 10. Nxe5 O-O 11. O-O-O Be6 12. Kb1 Nf5 13. Qe4 Bd5 14. Nxd5
cxd5 15. Qf4 Qe7 16. Rhe1 Rae8 17. Bd4 Nxd4 18. Qxd4 Bxe5 19. Qxd5+ Qe6 20.
Qxb7 Qb6 21. Qxb6 *
Position (FEN): 4rrk1/2p3pp/pQ6/4b3/8/8/PPP2PPP/1K1RR3 b - - 0 21
Black to move.
Themes:  Endgame  
Puzzle rating: 1494
Best move: cxb6