Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Other_variations
Moves: 1. d4 g6 2. c3 Bg7 3. g3 d6 4. Bg2 Nf6 5. Nf3 Nfd7 6. O-O O-O 7. Nbd2 c5 8. Re1
cxd4 9. Nxd4 Nc6 10. Nxc6 bxc6 11. Bxc6 Rb8 12. Bg2 Qb6 13. Nc4 Qc5 14. Ne3 Ne5
15. Nd5 Bb7 16. Nxe7+ Kh8 17. Bxb7 Rxb7 18. Qxd6 Qa5 19. Qa3 *
Position (FEN): 5r1k/pr2Npbp/6p1/q3n3/8/Q1P3P1/PP2PP1P/R1B1R1K1 b - - 2 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 1415
Best move: Qxa3