Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Symmetrical_Variation
Moves: 1. d4 Nf6 2. Nf3 d5 3. g3 e6 4. Bg2 Bd6 5. O-O Nc6 6. a3 h6 7. Nbd2 O-O 8. c4
Bd7 9. e4 dxe4 10. Ne1 Nxd4 11. Nxe4 Nc6 12. Nxd6 cxd6 13. Qxd6 Be8 14. Bf4 Qa5
15. Nf3 Rd8 16. Qc7 Qxc7 17. Bxc7 Rd7 18. Ba5 *
Position (FEN): 4brk1/pp1r1pp1/2n1pn1p/B7/2P5/P4NP1/1P3PBP/R4RK1 b - - 2 18
Black to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1183
Best move: Nxa5