Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Berlin_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Ne7 5. Nxe5 c6 6. Ba4 Qa5+ 7. Nc3 Qxe5 8.
f4 Qc7 9. O-O a6 10. e5 Nfd5 11. Bb3 Nxc3 12. bxc3 Nd5 13. Bb2 Bc5+ 14. d4 Ba7
15. c4 Ne7 16. Re1 O-O 17. c5 Nd5 18. Qf3 b6 19. Bxd5 *
Position (FEN): r1b2rk1/b1qp1ppp/ppp5/2PBP3/3P1P2/5Q2/PBP3PP/R3R1K1 b - - 0 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 1268
Best move: cxd5