Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Lasker-Pelikan_Variation
Moves: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bc4 a6 8.
Na3 b5 9. Bd5 Nxd5 10. Nxd5 f5 11. O-O f4 12. Nxf4 *
Position (FEN): r1bqkb1r/6pp/p1np4/1p2p3/4PN2/N7/PPP2PPP/R1BQ1RK1 b kq - 0 12
Black to move.
Themes:  Opening  
Puzzle rating: 1219
Best move: exf4