Chess puzzle (Advantage)
Opening: Kings_Gambit_Declined, Kings_Gambit_Declined_Panteldakis_Countergambit
Moves: 1. e4 e5 2. f4 f5 3. d3 d6 4. Nf3 Nf6 5. Nc3 Nc6 6. Be3 Be6 7. Qe2 Qe7 8. O-O-O
O-O-O 9. h3 h6 10. Kb1 Kb8 11. Bf2 Bf7 12. Qe3 Qe6 13. b3 b6 14. d4 fxe4 15.
Nxe4 *
Position (FEN): 1k1r1b1r/p1p2bp1/1pnpqn1p/4p3/3PNP2/1P2QN1P/P1P2BP1/1K1R1B1R b - - 0 15
Black to move.
Themes:  Middlegame  
Puzzle rating: 2008
Best move: exf4