Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_McDonnell_Attack
Moves: 1. e4 c5 2. f4 Nc6 3. Nf3 Nf6 4. Nc3 e6 5. d4 d5 6. e5 Nd7 7. Be2 a6 8. O-O
cxd4 9. Nxd4 *
Position (FEN): r1bqkb1r/1p1n1ppp/p1n1p3/3pP3/3N1P2/2N5/PPP1B1PP/R1BQ1RK1 b kq - 0 9
Black to move.
Themes:  Opening  
Puzzle rating: 797
Best move: Nxd4