Chess puzzle (Crushing)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Other_variations
Moves: 1. d4 d5 2. c3 Nc6 3. Na3 Nf6 4. Nb5 Bf5 5. Nf3 e6 6. Ne5 Na5 7. b4 Nc4 8. Qa4
Bd6 9. Nxd6+ Ke7 10. Nb5 Kf8 11. Qa5 *
Position (FEN): r2q1k1r/ppp2ppp/4pn2/QN1pNb2/1PnP4/2P5/P3PPPP/R1B1KB1R b KQ - 4 11
Black to move.
Themes:  Middlegame  
Puzzle rating: 986
Best move: Nxa5