Chess puzzle (Advantage)
Moves: 1. d4 d5 2. Bf4 Nf6 3. c4 e6 4. Nc3 dxc4 5. e3 Bd6 6. Bg3 O-O 7. Bxc4 Bxg3 8.
hxg3 Qe7 9. Qd3 Bd7 10. e4 e5 11. d5 Na6 12. Bxa6 bxa6 13. Nf3 Bb5 14. Qe3 c6
15. Nxb5 Qb4+ 16. Nc3 Qxb2 17. Rb1 Qa3 18. dxc6 Rfc8 19. Nxe5 Qd6 20. Rb7 Qxe5
21. Nd5 *
Position (FEN): r1r3k1/pR3ppp/p1P2n2/3Nq3/4P3/4Q1P1/P4PP1/4K2R b K - 1 21
Black to move.
Themes:  Middlegame  
Puzzle rating: 1739
Best move: Nxd5