Chess puzzle (Crushing)
Opening: Nimzo-Larsen_Attack, Nimzo-Larsen_Attack_Modern_Variation
Moves: 1. b3 e5 2. Bb2 Qf6 3. e3 Bc5 4. Nf3 d6 5. Nc3 c6 6. Qe2 Bb6 7. O-O-O Be6 8. d4
exd4 9. exd4 Ba5 10. Ne4 Qh6+ 11. Kb1 d5 12. Nd6+ Kd7 13. Nxb7 Bb6 14. Ne5+ Kc7
15. Nc5 Qf6 16. Nf3 Nh6 17. Na6+ Kb7 18. Nb4 Nf5 19. Qa6+ *
Position (FEN): rn5r/pk3ppp/Qbp1bq2/3p1n2/1N1P4/1P3N2/PBP2PPP/1K1R1B1R b - - 12 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 934
Best move: Nxa6