Chess puzzle (Advantage)
Opening: London_System, London_System_Other_variations
Moves: 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. c4 O-O 5. Nc3 c5 6. e3 Qa5 7. Bd3 Nh5 8. Be5
f6 9. Bg3 Nc6 10. dxc5 Qxc5 11. a3 Nxg3 12. hxg3 f5 13. Qc2 e5 14. Ng5 h6 15.
Nh3 Ne7 16. O-O-O a6 17. Be2 b5 18. Nd5 Bb7 19. Nxe7+ *
Position (FEN): r4rk1/1b1pN1b1/p5pp/1pq1pp2/2P5/P3P1PN/1PQ1BPP1/2KR3R b - - 0 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 898
Best move: Qxe7