Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 b5 6. Bb3 Be7 7. Be3 O-O 8. c3
d6 9. h3 Na5 10. Nbd2 c5 11. a3 Nxb3 12. Qxb3 Qc7 13. c4 bxc4 14. Nxc4 Rb8 15.
Qc2 Bd7 16. b3 Be6 17. Rb1 Bxc4 18. Qxc4 Rfd8 19. Qxa6 d5 20. O-O *
Position (FEN): 1r1r2k1/2q1bppp/Q4n2/2ppp3/4P3/PP1PBN1P/5PP1/1R3RK1 b - - 1 20
Black to move.
Themes:  Middlegame  
Puzzle rating: 1780
Best move: Ra8