Chess puzzle (Advantage)
Moves: 1. d4 Nf6 2. c4 d6 3. Nc3 g6 4. e4 Bg7 5. Be2 Nbd7 6. Nf3 O-O 7. O-O Re8 8. Re1
c5 9. d5 e6 10. Bf1 exd5 11. exd5 Rxe1 12. Qxe1 Nb6 13. Bf4 Bg4 14. Nd2 Qf8 15.
Nb5 Rd8 16. Nc3 Re8 17. Qc1 Qe7 18. h3 Bf5 19. g4 Nxg4 20. hxg4 Qh4 21. Bxd6 *
Position (FEN): 4r1k1/pp3pbp/1n1B2p1/2pP1b2/2P3Pq/2N5/PP1N1P2/R1Q2BK1 b - - 0 21
Black to move.
Themes:  Middlegame  
Puzzle rating: 2071
Best move: Bd4