Chess puzzle (Advantage)
Opening: English_Opening, English_Opening_Anglo-Scandinavian_Defense
Moves: 1. c4 d5 2. cxd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Bd2 c6 6. Nf3 Bf5 7. Ne5 Nbd7 8.
Nxd7 Nxd7 9. e4 Bg6 10. Bc4 e6 11. O-O Qc7 12. Re1 Bd6 13. e5 Be7 14. f4 O-O-O
15. Qa4 *
Position (FEN): 2kr3r/ppqnbppp/2p1p1b1/4P3/Q1BP1P2/2N5/PP1B2PP/R3R1K1 b - - 2 15
Black to move.
Themes:  Middlegame  
Puzzle rating: 1933
Best move: Nb6