Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Taimanov_Variation
Moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Nxd4 6. Qxd4 d6 7. Be2 Be7 8.
Qxg7 Bf6 9. Qg3 Ne7 10. Bf4 Rg8 11. Qf3 Ng6 12. O-O-O *
Position (FEN): r1bqk1r1/pp3p1p/3ppbn1/8/4PB2/2N2Q2/PPP1BPPP/2KR3R b q - 8 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1600
Best move: Nxf4