Chess puzzle (Crushing)
Opening: Alekhine_Defense, Alekhine_Defense_Normal_Variation
Moves: 1. e4 Nf6 2. e5 Nd5 3. Nf3 d6 4. exd6 cxd6 5. d4 Nc6 6. c4 Nb6 7. Nc3 Bf5 8.
Be2 Nb4 9. Qa4+ *
Position (FEN): r2qkb1r/pp2pppp/1n1p4/5b2/QnPP4/2N2N2/PP2BPPP/R1B1K2R b KQkq - 6 9
Black to move.
Themes:  Middlegame  
Puzzle rating: 1449
Best move: Nxa4