Chess puzzle (Advantage)
Moves: 1. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7 4. Qd5 Nb4 5. Qc4 d5 6. exd6 Qxd6 7. Bd2 Bf5 8.
Bxb4 Qxb4+ 9. Qxb4 Bxb4+ 10. c3 Ba5 11. e3 O-O-O 12. Nd4 Bg6 13. Nd2 Nf6 14.
O-O-O Rhe8 15. Nc4 Bb6 16. Nxb6+ axb6 17. h3 Re5 18. Bc4 Ra5 19. Bb3 Ne4 20.
Rhf1 Nc5 21. a3 *
Position (FEN): 2kr4/1pp2ppp/1p4b1/r1n5/3N4/PBP1P2P/1P3PP1/2KR1R2 b - - 0 21
Black to move.
Themes:  Middlegame  
Puzzle rating: 1555
Best move: Rxd4