Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Colle_System
Moves: 1. d4 d5 2. Nf3 Nf6 3. e3 Bg4 4. Be2 e6 5. c4 c6 6. Qb3 Qb6 7. Qxb6 axb6 8. h3
Bh5 9. O-O Bd6 10. Re1 O-O 11. Bd2 Ne4 12. Nc3 *
Position (FEN): rn3rk1/1p3ppp/1ppbp3/3p3b/2PPn3/2N1PN1P/PP1BBPP1/R3R1K1 b - - 8 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1475
Best move: Bxf3