Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Bishop_Attack
Moves: 1. d4 g6 2. e4 Bg7 3. Bc4 e6 4. Nf3 c6 5. O-O b5 6. Bb3 Bb7 7. c4 a6 8. Nc3 d6
9. c5 Nf6 10. Bf4 dxc5 11. e5 cxd4 *
Position (FEN): rn1qk2r/1b3pbp/p1p1pnp1/1p2P3/3p1B2/1BN2N2/PP3PPP/R2Q1RK1 w kq - 0 12
White to move.
Themes:  Middlegame  
Puzzle rating: 1123
Best move: exf6