Chess puzzle (Crushing)
Moves: 1. d4 d5 2. c4 e6 3. a3 Nf6 4. Nc3 Be7 5. e3 a6 6. Nf3 Nbd7 7. Bd3 dxc4 8. Bxc4
b5 9. Bd3 c5 10. dxc5 Nxc5 11. Be2 Bb7 12. O-O O-O 13. Qxd8 Rfxd8 14. b4 Nce4
15. Nxe4 Nxe4 16. Bb2 Rac8 17. Rac1 h6 18. Rxc8 Rxc8 19. Rc1 Rxc1+ 20. Bxc1 Nc3
21. Bd3 Bf6 22. Kf1 Kf8 23. Nd2 *
Position (FEN): 5k2/1b3pp1/p3pb1p/1p6/1P6/P1nBP3/3N1PPP/2B2K2 b - - 6 23
Black to move.
Themes:  Endgame  
Puzzle rating: 1611
Best move: Na2