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. Bg5 e6 7. Qd2 Be7 8. Be2
h6 9. Bh4 g5 10. Bg3 Nbd7 11. f4 gxf4 12. Bh4 e5 *
Position (FEN): r1bqk2r/1p1nbp2/p2p1n1p/4p3/3NPp1B/2N5/PPPQB1PP/R3K2R w KQkq - 0 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1674
Best move: Nf5