Chess puzzle (Advantage)
Opening: Zukertort_Opening, Zukertort_Opening_Sicilian_Invitation
Moves: 1. Nf3 c5 2. e3 Nc6 3. c4 g6 4. Nc3 Bg7 5. d4 d6 6. Be2 e6 7. O-O a6 8. d5 Nce7
9. e4 Nf6 10. Bg5 O-O 11. Qc2 e5 12. Ne1 Bg4 *
Position (FEN): r2q1rk1/1p2npbp/p2p1np1/2pPp1B1/2P1P1b1/2N5/PPQ1BPPP/R3NRK1 w - - 2 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1347
Best move: Bxf6