Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Mongredien_Defense
Moves: 1. d4 g6 2. e4 Bg7 3. Nf3 b6 4. Be2 e6 5. Bg5 f6 6. Be3 Ne7 7. O-O c5 8. c3
Nbc6 9. d5 exd5 10. exd5 Ne5 11. c4 f5 12. Bg5 Nxf3+ *
Position (FEN): r1bqk2r/p2pn1bp/1p4p1/2pP1pB1/2P5/5n2/PP2BPPP/RN1Q1RK1 w kq - 0 13
White to move.
Themes:  Middlegame  
Puzzle rating: 896
Best move: Bxf3