Chess puzzle (Advantage)
Moves: 1. d4 g6 2. Bf4 Bg7 3. e3 d6 4. Nf3 e6 5. c4 Ne7 6. Nc3 O-O 7. Bd3 Nd7 8. Qc2
b6 9. O-O Bb7 10. Be4 d5 11. cxd5 exd5 12. Bd3 c5 13. Nb5 c4 14. Be2 Nf6 15.
Nd6 Qd7 16. Nxb7 Qxb7 17. Ne5 Ne4 18. f3 Nf6 19. a4 Nc6 20. e4 *
Position (FEN): r4rk1/pq3pbp/1pn2np1/3pN3/P1pPPB2/5P2/1PQ1B1PP/R4RK1 b - - 0 20
Black to move.
Themes:  Middlegame  
Puzzle rating: 1410
Best move: Nxd4