Chess puzzle (Crushing)
Opening: Vienna_Game, Vienna_Game_Falkbeer_Variation
Moves: 1. e4 e5 2. Nc3 Nf6 3. d3 Bb4 4. Bd2 d6 5. a3 Bc5 6. f4 Ng4 7. Nh3 O-O 8. Be2
Nf6 9. g4 *
Position (FEN): rnbq1rk1/ppp2ppp/3p1n2/2b1p3/4PPP1/P1NP3N/1PPBB2P/R2QK2R b KQ - 0 9
Black to move.
Themes:  Opening  
Puzzle rating: 1562
Best move: Nxg4