Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. Bf4 e6 4. e3 c6 5. Nf3 Bb4+ 6. Nc3 Qa5 7. Be2 Ne4 8. O-O
Nxc3 9. bxc3 Bxc3 10. cxd5 Bxa1 11. dxe6 Bc3 *
Position (FEN): rnb1k2r/pp3ppp/2p1P3/q7/3P1B2/2b1PN2/P3BPPP/3Q1RK1 w kq - 1 12
White to move.
Themes: Advanced Pawn, Attacking f2 or f7 Middlegame  
Puzzle rating: 1391
Best move: exf7+