Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Accelerated_London_System
Moves: 1. d4 d5 2. Bf4 Nf6 3. e3 Bf5 4. Nf3 e6 5. c4 Nh5 6. Bg5 Be7 7. Bxe7 Qxe7 8.
Qa4+ c6 9. cxd5 exd5 10. Nc3 O-O 11. Be2 Re8 12. Qb3 Nf4 *
Position (FEN): rn2r1k1/pp2qppp/2p5/3p1b2/3P1n2/1QN1PN2/PP2BPPP/R3K2R w KQ - 6 13
White to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1441
Best move: exf4