What is the best continuation for Black?

Casual Game, https://itsyourturn.com
Alexander vs. John Coffey

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

(black to move) 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Bb5 Qa5 6. Bxc6+ bxc6 7. Bd2 Qb6 8. Bc1 Ba6 9. Nf3 Rb8 10. b3 cxd4 11. cxd4 Nh6 12. Bxh6 gxh6 13. Nbd2 Ba3 14. Qc2 c5 15. Qc3 Rc8

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

 

Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight