Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_London_System
Moves: 1. d4 d5 2. Bf4 Nf6 3. Nf3 e6 4. Nc3 Bb4 5. a3 Ba5 6. e3 Ne4 7. Qd3 O-O 8. b4
Bb6 9. Nxe4 dxe4 10. Qxe4 Nc6 11. Bd3 *
Position (FEN): r1bq1rk1/ppp2ppp/1bn1p3/8/1P1PQB2/P2BPN2/2P2PPP/R3K2R b KQ - 2 11
Black to move.
Themes:  Middlegame  
Puzzle rating: 1332
Best move: f5