What is the correct move for Black?

Live Chess, Chess.com
aherring74 (1926) vs. john2001plus (1930)

1 2 3 4 5 6 7 8 h g f e d c b a 0

(black to move) 1. e4 c5 2. d4 cxd4 3. c3 d5 4. exd5 Qxd5 5. cxd4 Nc6 6. Nf3 Bg4 7. Nc3 Bxf3 8. gxf3 Qxd4 9. Qxd4 Nxd4 10. Nb5 Ne6 11. Be3 a6 12. O-O-O Rc8+ 13. Nc3 g5 14. Bh3 Bg7 15. Rd3 Bxc3 16. bxc3 Rd8 17. Rxd8+ Nxd8 18. Bxg5 h6 19. Be3 Nf6 20. Rd1 e6

[ Flip the board | Reset | Options… ] Play chess online

 

Options:
	- allow legal moves only;
	- use short algebraic notation;
movement/animation speed: (slow) (fast)
	- show legal moves;

 

Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight