Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Najdorf_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Nc6 8. f3
Be7 9. Bc4 O-O 10. Qd2 b5 11. Bd5 Bb7 12. O-O-O Nxd5 *
Position (FEN): r2q1rk1/1b2bppp/p1np4/1p1np3/4P3/1NN1BP2/PPPQ2PP/2KR3R w - - 0 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1721
Best move: Nxd5