Chess puzzle (Advantage)
Opening: Kings_Gambit_Declined, Kings_Gambit_Declined_Falkbeer_Countergambit
Moves: 1. e4 e5 2. f4 d5 3. exd5 exf4 4. c4 Qh4+ 5. Ke2 Bg4+ 6. Nf3 Bc5 7. d4 Bxf3+ 8.
gxf3 Qe7+ 9. Kd3 Nd7 10. Bxf4 Bd6 11. Qd2 Bxf4 12. Qxf4 O-O-O 13. Bh3 Kb8 14.
Nc3 Qb4 15. a3 Qb3 16. a4 *
Position (FEN): 1k1r2nr/pppn1ppp/8/3P4/P1PP1Q2/1qNK1P1B/1P5P/R6R b - - 0 16
Black to move.
Themes:  Middlegame  
Puzzle rating: 1955
Best move: Nb6