Chess puzzle (Crushing)
Opening: Ruy_Lopez, Ruy_Lopez_Cozio_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7 4. O-O g6 5. d4 exd4 6. Qxd4 *
Position (FEN): r1bqkb1r/ppppnp1p/2n3p1/1B6/3QP3/5N2/PPP2PPP/RNB2RK1 b kq - 0 6
Black to move.
Themes:  Opening  
Puzzle rating: 606
Best move: Nxd4