Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Chigorin_Variation
Moves: 1. d4 d5 2. Nc3 e5 3. dxe5 d4 4. Nb5 Nc6 5. Nf3 Bg4 6. Nfxd4 Nxe5 7. Bf4 f6 8.
f3 Bh5 9. e3 a6 10. Nc3 Qd7 11. Qe2 O-O-O 12. O-O-O Qf7 13. g4 Bg6 14. h4 h5
15. g5 Bb4 16. Na4 *
Position (FEN): 2kr2nr/1pp2qp1/p4pb1/4n1Pp/Nb1N1B1P/4PP2/PPP1Q3/2KR1B1R b - - 2 16
Black to move.
Themes:  Middlegame  
Puzzle rating: 1535
Best move: Qxa2