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. Be2 e5 7. Nb3 Be7 8. Be3
Nbd7 9. O-O O-O 10. f4 b5 11. Nd5 Nxe4 *
Position (FEN): r1bq1rk1/3nbppp/p2p4/1p1Np3/4nP2/1N2B3/PPP1B1PP/R2Q1RK1 w - - 0 12
White to move.
Themes:  Opening  
Puzzle rating: 1489
Best move: Bf3