Chess puzzle (Crushing)
Moves: 1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Bf4 Nc6 5. Nf3 Bb4+ 6. Nbd2 Qe7 7. e3 Ngxe5
8. Nxe5 Nxe5 9. Bxe5 Qxe5 10. a3 Bxd2+ 11. Qxd2 d6 12. Bd3 Bf5 13. Bxf5 Qxf5
14. O-O O-O-O 15. b4 d5 16. c5 Qe5 17. b5 d4 18. exd4 Rxd4 19. Qc3 Rhd8 20. c6
b6 21. Qh3+ Kb8 22. a4 Rd2 23. a5 *
Position (FEN): 1k1r4/p1p2ppp/1pP5/PP2q3/8/7Q/3r1PPP/R4RK1 b - - 0 23
Black to move.
Themes:  Endgame  
Puzzle rating: 1637
Best move: Qxa1